Best Cool-Mist Humidifier Choice Without Exception: Levoit Ultrasonic Cool-Mist Humidifier

Levoit Ultrasonic Cool-Mist HumidifierI love this 3 in 1 humidifier (I have the white color one) and often find myself using my favorite pure essential oils in it! It puts out a nice soft mist that’s cool and soothing to the skin.

The humidifier has a small light on the front, but I don’t care for night lights when I sleep, so I turn the light off at night and sometimes turn it on during the day. (The kids love turning the light on all the time though). The nozzle on top turns around and can be put to any place you want the mist to come out. I think anyone buying this humidifier will not be disappointed.

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Also Great: Pure Enrichment Ultrasonic Cool-Mist Humidifier

Pure Enrichment Ultrasonic Cool-Mist HumidifierThis humidifier does wonders for colds and congestion. It’s easy to clean, and I use purified water so that there is no mineral build-up inside. It’s nice that the light turns off, since I like sleeping in the dark. I find it helps with my dry eyes problem, and with LASIK surgery I never want them dry. This is a wonderful help to little ones with colds and sniffles. I highly advise getting this one for its simplicity of operation and compactness.

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Best Cool- and Warm-Mist Humidifier Choice Without Exception: Levoit Hybrid Ultrasonic Cool- and Warm-Mist Humidifier with Remote

Levoit Hybrid Ultrasonic Cool- and Warm-Mist Humidifier with RemoteI love the remote control that comes with this humidifier! It won’t wake the baby when I use it in his nursery and I can turn off the light. Eucalyptus essential oil can be put in the little box for when the baby has congestion. It’s made to be sturdy and quiet.

I just set the timer and it shuts down when the water is low or gone. Plus, I can set the humidity where I want it. Turning the nozzle on the top lets me aim the mist in the direction where I want it, which is awesome! This unit is highly recommended. It holds a lot of water so you can fill it up and let be for a while.

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Latest Update: 351 people who love humidifiers have responded to our survey, What Features to Look for When Choosing a Humidifier. Below are our best choice picks followed by a complete comparison chart for all the humidifiers reviewed.



Levoit Humidifier

Levoit LV600HH

TaoTronics Humidifier

TaoTronics® TT-AH007

Air-O-Swiss AOS 7147 Humidifier

Air-O-Swiss AOS 7147

Water Capacity1.3 gal.1.6 gal.1.4 gal.3 gal.
Whisper-Quiet FanYesYesYesYes
Auto ShutoffYesYesYesYes
Adjustable MistYesYesYesYes
Essential Oil TrayNoYesNoNo
LED DisplayNoYesYesYes
Run-Time Hours 14-1720-361524
360° NozzleNoYesYesNo





Humidifiers are systems for adding moisture to the air circulating inside houses and buildings. They provide water vapor or steam to increase the relative humidity.

If you are a mom or dad, you never want to see your baby or children be sick. It hurts us parents to see them hurting. When your doctor tells you to get a humidifier or you intuitively know the moisture will help baby’s congestion, stuffiness, croup, bronchitis, cough, and hopefully not the flu, then check out our reviews of the best humidifiers for babies.

Remember that a cool-mist humidifier is best. Warm or hot air increases the swelling in baby’s airways. Humidifiers are an environment for germs and bacteria ready to happen and multiply! Be mindful to wash it out with bleach and vinegar every day adding fresh new distilled or purified water for the baby. The little one does not need to breathe in minerals and lime scale from city tap water. And don’t use soft water; it uses salt to “soften” tap water.

Benefits of Using a Humidifier

benefits of using a humidifier infographic

The amount of water vapor in the air is known as humidity (moisture). You can see it outside on foggy days. Depending on the season and where you live, humidity will be higher during the summer. It will be lower during the cold wintertime. Home humidity should be between 30 and 60%. Problems can occur when humidity is too high or too low.

  • Low Humidity irritates nasal passages, might cause dry skin, cause eyelids to itch, and makes the throat dry with a cough.
  • High Humidity causes condensation on windows, makes your home feel stuffy and it is hard to breathe in high humidity feeling like a sauna. High humidity activates unsafe bacteria, mold, mildew, and dust mites. Allergies, asthma outbreaks, and other respiratory problems can be triggered by high humidity levels.


Top 8 Best Indoor Humidity and Temperature Monitors

Additionally, with humidity too low, static electricity may become a problem causing irritating static cling of fabrics and the slight shocks you can get when touching doorknobs or metal. Furniture can crack and dry out, and papers can dry and crumble.

To be healthy you want the benefits of humidity at a level to provide comfort to avoid any health issues by having your humidity level too high.

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Best Dehumidifiers Best Air Purifiers

Humidifier and Diffuser Differences—What to Choose

In cold weather climates, a humidifier will add beneficial moisture to inside air. A diffuser adds fragrant scents to the air using essential oils derived from plants and the mist is diffused into the air with moisture. Another device, the vaporizer adds medication to the moisture diffusing the medication with the mist when someone has a cold or illness. Each one has its own unique benefits.

READ MORE: Diffuser vs. Humidifier – Which Should You Buy?

Types of Humidifiers

Homes use small units for point-on moisture in one room. There are a number of types that are listed below:

  • Central Humidifiers humidify the whole house and are built into heating and air conditioning systems. The newer wall thermostats allow you to select the percentage of humidity you want.
  • Impeller Humidifiers use a rotating disk to produce a cool-mist.
  • Ultrasonic Humidifiers use Ultrasonic vibration to produce a cool-mist.
  • Evaporators use a fan to move air through a filter, wet wick, or belt.
  • Steam Vaporizers create steam that cools before leaving the machine using electricity. Do not use this type of humidifier if children are around; the hot water inside it can cause burns, blisters, and scalding when spilled.

Ultrasonic Humidifiers use a metal diaphragm that vibrates at a high frequency to produce a cool or warm-mist. The sound vibrations push moisture into the air. The water molecules are micro-fine and the mist is absorbed into the air almost instantly. This humidifier type does not use a fan; therefore, it operates quietly not using filters.

Warm-Mist Humidifiers are the least expensive and they use boiled water for producing steam. Before being released into the air, the steam is slightly cooled. The warm-mist tabletop units will raise air temperature in a room and are quieter than evaporative humidifiers but cost more to operate. These units raise the air temperature that is nice for winter, but not so nice in warm areas. The heated water can cause accidental scalding. No one suffering from asthma should use a warm-mist humidifier because the warm-mist can irritate the airways.

Vaporizers boil water and releases steam moisture into the air. To reduce coughs and colds, stuffy sinus passages, medicated inhalants are sometimes added to be misted into the air. Being healthier to use than the cool-mist humidifiers, the steam is not as likely to disperse microorganisms or impurities in the holding tank water. More energy is required however, to boil water than other methods used. There are small single room vaporizers available that are used at bedtime or when a child or person is in bed feeling sick.

Cool-Mist Impeller Humidifiers use a spinning disk for delivering the water into a diffuser forming water droplets that float into the air. It can put dissolved minerals and microorganisms into the air. The dissolved minerals from tap water can appear as white dust on items in your home. Use distilled water to prevent this, which also adds to the cost of operating a cool-mist humidifier.

Evaporative Humidifiers use a fan for sending moisture out after having first soaked water up into a wick. This type is provided as large console types.

These small units are not expensive and the filtering system helps keep water minerals and microorganisms from entering the air. It is important to do timely maintenance on these units. The unit must be cleaned and replaced with new filters as recommended by the manufacturer. These are the most common in the marketplace, also known as wick or cool-mist humidifiers. The filters or wicks can become moldy when not thoroughly dried out between reservoir fillings. Over time, they also can have mineral deposits build up. When this happens, the filters need to be rinsed or replaced. If not done, the air cannot pass through the filter or wick and the unit stops humidifying. When you see the water at the same level in the reservoir, you will know the unit is not working.

The water in the unit evaporates based upon the relative humidity in the room. If a room has low humidity, the humidifier’s water will evaporate faster than a room that has high humidity. Consequently, this type of humidifier is self-regulating and as the humidity rises in a room, the water vapor goes down.

Whole-House Furnace Humidifiers - Winter not only brings cold, it also brings with it dry air. Retrofitting a humidifier to your existing furnace will do wonders for the lack of moisture in your home. Humidity extends the life of your wood floors, wood furniture, pianos, and art when a home is too dry. You will feel warmer when your home has humidity. You will not need to turn the heat higher with humidity to keep the house perfect. When you keep your home’s humidity between 30 and 60%, for health and keeping nosebleeds and mucous membranes moistened, you will be more comfortable. It is only wise to have additional humidity in your home’s air.

Comfort Zone Humidity Range infographic

Which Humidifier is Right for You?

First, decide on whether you want to humidify your whole house or just one room, usually a bedroom. A small unit for your child’s room or a bedroom will usually be sufficient. When you live in a dry, arid climate, or have serious sinusitis, dry coughs, dry flaky skin, and dry hair, you might want to consider a whole-house furnace system.

  • Be sure to purchase the right capacity and size for the specific room to humidify.
  • Portable and tabletop humidifiers are great for one room. They can be purchased with two tank sizes for different room sizes.
  • Whole-house humidifier systems are wonderful for adding moisture to an entire house using the furnace ductwork and are thermostatically controlled. A retrofit to an existing furnace is expensive. These units connect permanently to the water supply. No filling of water tanks is required. They are best installed by a heating and ventilation professional who will mathematically calculate the square footage of the house to be humidified to install the correct size system.

Top 9 Best Single Room Humidifiers

Best Cool-Mist Humidifiers Best Warm-Mist Humidifiers Best Cool- and Warm-Mist Humidifiers

Note: Click the pictures to check the best prices, read all customer reviews, and get more information.

PicturesTypeWater CapacitySquare FootageRun-Time Hrs.HumidistatAdjustable
360° NozzleReview
Pure Enrichment

Pure Enrichment PEHUMIDIF

Cool-Mist0.4 gal.25016NoNoNo


Levoit Ultrasonic Cool-Mist Humidifier

Levoit LV400CH

Cool-Mist1.1 gal.25020-30NoYesYes




Cool-Mist1.3 gal.60014-17NoYesNo


TaoTronics Humidifier

TaoTronics® TT-AH001

Cool-Mist1.1 gal.53815YesYesYes


Levoit Humidifier

Levoit LV600HH

Cool/Warm-Mist1.6 gal.28020-36YesYesYes


TaoTronics Humidifier

TaoTronics® TT-AH007

Cool/Warm-Mist1.4 gal.500 15YesYesYes


Air-O-Swiss AOS 7147 Humidifier

Air-O-Swiss AOS 7147

Cool/Warm-Mist3 gal.60024YesYesNo


Honeywell™ Humidifier

Honeywell™ HCM-350

Cool-Mist2 gal.50024NoYesNo


Vicks Humidifier

Vicks® V745

Warm-Mist1 gal.100012NoYesNo


Best Cool-Mist Humidifier Reviews

1. Pure Enrichment Ultrasonic Cool-Mist Humidifier

Our Rating: 5 out of 5 stars

The Pure Enrichment® model number PEHUMIDIF, is a premium ultrasonic humidifier emitting a cool mist and is whisper-quiet for sleeping all night thorough. This unit is a top best seller on® at an affordable price in white and light blue colors.

The unit humidifies the air in your room for a greatest run time of 16 hours continuously. After the water is gone it will shut off by design automatically. It has a soft blue night light that can be comforting to a sick child at night time. The light can be turned off when you push the power button 2 times. If you like, you can set the light to low or high without the light or with the light at low to high. It’s a personal preference for the function you prefer.

It is excellent to have and use for congestion, asthma, colds, flu, allergies, dry skin, and static electricity in the air—the door knob that zings you and the flyaway hair and clothes clinging to your body.

The misting nozzle at the top will turn 360-degrees so that you never need to move the unit to disperse the mist where you want it. Holding 0.4 gallons (50 ounces) (1.5 liters) of water in the reservoir will give you 250-square feet of coverage. This should encompass a large bedroom, living room, and baby’s room sufficiently distributing 5 ounces (150 mL) of mist each hour. That’s very good coverage using the low- or high-mist setting. It does have a beep sound and cannot be disabled.

The feet on the bottom will not slip or skid to hold the tank in place securely for safety and no water to clean up. No filters are installed or used with this humidifier.

For a healthy environment, it’s necessary to have moisture in the air to breathe in and to keep mucous membranes from becoming dry. Moisture ends a dry mouth and throat, dry eyes, dry skin and hair, sinusitis, and nasal congestion. Moisture is beneficial to infants, babies, youngsters, and all people and pets in your family, including healthier vibrant plants.

Pure Enrichment Ultrasonic Cool-Mist Humidifier featrues infographic

Use soft, distilled, or bottled water for best results rather than tap water. The minerals from hard water create a white dust when misting and the lime scale will clog up the inner workings and mister. The nozzle comes out and can be cleaned daily if you run the unit each day. Water must be changed each day as well to avoid mold growth.

Use the included brush for getting into corners and groves and clear distilled vinegar is the best for removing debris; add a few drops of bleach. Be sure to check the box carefully for the brush—it is there. Do not get water in the dry air exhaust hole. Do not put any of the plastic parts in the dishwasher even on the top rack.

Pure Enrichment Ultrasonic Cool-Mist Humidifier diagram of how to use

Do not use essential oils, eucalyptus, additives, salt, or Vicks® VapoRub® in this unit. It will clog up the works and ruin the ultrasonic disc. If you want to use essential oils, buy a diffuser that also mists. It does not have a gauge to tell you the humidity. You might want to buy a humidity and temperature monitor  or see the humidifiers here that have a 100% pure essential oil cup for adding essential oils to the mist:  Levoit Ultrasonic Cool-Mist Humidifier and Levoit Hybrid Ultrasonic Cool- and Warm-Mist Humidifier with Remote control.

Plug the UL® listed 110/120-Volt, 50/60 Hz 4-foot cord into a USA outlet. Outside the USA, Canada or Mexico buy a 220/240-Volt adapter. In the USA, it operates at 0.5 Amps. You can also use the included 240-Volt D/C cord.

For your assurance in buying and using the Pure Enrichment® humidifier, it has been ETL (Electrical Testing Laboratories) certified passing a thorough safety inspection

The dimensions are 8-inches long x 6-inches wide x 9-inches high and it weighs about 1.5 pounds.

Gift-wrapping is available. You will receive the humidifier, A/C adapter, disk cleaning brush, User’s Manual, and the Ultrasonic Cool Mist Humidifier is backed by Pure Enrichment’s® industry-leading 2-year Warranty so your satisfaction is guaranteed. The unit is made in China.

Pure Enrichment® Ultrasonic Cool Mist Humidifier video.

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2. Levoit Ultrasonic Cool-Mist Humidifier

Levoit Ultrasonic Cool-Mist Humidifier

Our Rating: 5 out of 5 stars

The Levoit model number LV400CH is a 3-in-1-unit functioning as a humidifier, aroma diffuser, and nightlight that can be turned off. For health, the water is double-filtered with activated carbon and ceramic filters. These put bacteria at bay creating a very fine mist.

The tank holds 4L (1.1 gallons) of water that will run 20 to 30 hours continually. The single spraying nozzle turns 360-degrees. You can put it in any room for safe use with babies, kids, pets, and adults.

The whisper-quiet device emits a cool-mist for easier breathing when someone has congested and dry nasal passages, sinusitis, and dry skin in winter or summer. Your plants will love the humidity too. It will mist low or high the way you like it best. The humidifier will shut off automatically when it runs out of water.

360 degrees Mist Nozzle demonstration

Clean the unit each week and the water filter every 6-months or more often. Distilled or purified water is best for the unit. City tap water has minerals and lime scale that builds up inside the unit very difficult to remove. Use clear distilled vinegar to clean the unit, rinse, and let dry.

demonstration of someone adding essential oil drops to diffuser

Add your favorite essential oils to the oil tray and close tightly for a lovely and relaxing aromatherapy experience. Have it both ways—humidity with fragrance.

The Dimensions are 6.18- x 9.84- x 9.84-inches and weighs about 2-pounds.

Plug the UL® listed 110/120-Volt, 50/60 Hz cord into a USA outlet. Output power is 25-Watts. Outside the USA, Canada or Mexico buy a 220/240-Volt adapter.

Gift-wrapping is available. You will receive the humidifier, 3 aroma pads, a User’s Manual, and a 2-year Limited Warranty with lifetime support. The unit is made in China.

Levoit Cool Mist Ultrasonic Humidifier LV400CH Review video.

Levoit Ultrasonic Cool-Mist Humidifier in a children's playroom

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3. URPOWER Ultrasonic Cool-Mist Humidifier

URPOWER Ultrasonic Cool-Mist Humidifier

Our Rating: 5 out of 5 stars

The URPOWER larger 5 L (5.3 Quarts) water reservoir will release a cool-mist in any room of your home. The unit is elegant for any décor with a black and silver tone matte finish. The high-end model number MH501 is a very best seller and at a reasonable price for its size and many functions. It comes with a plastic filter and be sure you seat it tightly. It does not have to be replaced; just keep it clean. This is not an air purifier; it is a humidifier.

It will run from 14 to 17 hours without needing to be refilled and that’s an entire day and night. When the water is used, it will automatically shut off. It is whisper-quiet and is perfect for a sick fussy baby or congested child. Put in in your office, bedroom, baby’s room or wherever you need more moisture. The superior URPOWER satisfactorily dispenses 12-ounces (350 mL) of mist each hour. The unit is BPA (bisphenol A)-free. It should cover about 600-square feet. This humidifier does not use filters.

URPOWER Ultrasonic Cool-Mist Humidifier infographic of which rooms in which it could be helpful

It’s always best to put clean water in the tank daily to avoid mold and mildew growth. It’s also best to use distilled or purified water because city tap water has minerals and lime scale that clogs up the unit and emits a white dust on furniture. Clean the unit and transducer weekly using cotton swabs with clear distilled vinegar and a few drops of bleach. To store the unit, be sure it’s clean, rinsed, and dry. Put it back in its original box with the instructions for next time.

The humidifier adds moisture to the air to sooth a dry sore throat and mouth, nasal congestion, upper respiratory tract infections, dry itchy skin, hair, and nails, and can reduce dust mites. With humidity people with allergies and asthma will find relief.  You cannot use essential oils or additives with this humidifier or any humidifier unless it is made for those products.

URPOWER Ultrasonic Cool-Mist Humidifier infographic of improving air quality

Plug the UL® listed 110/120-Volt, 50/60 Hz cord into a USA outlet. Outside the USA, Canada or Mexico buy a 220/240-Volt adapter.

Gift-wrapping is available. You will receive the humidifier, User’s Manual, and a 90-day Warranty. The unit is made in China.

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4. TaoTronics TT-AH001 Ultrasonic Cool-Mist Humidifier

TaoTronics TT-AH001 Ultrasonic Cool-Mist Humidifier

Our Rating: 5 out of 5 stars

The wonderful and expensive TaoTronics® Humidifier Ultrasonic Cool-Mist unit provides a constant humidity mode switch, a mist level control, and timer settings, with a wonderful built-in water purifier. It makes no noise and has an LED night light with a 360-degree turning nozzle. This humidifier is a cool-mist only; not a warm-mist.

You can set the mist modes to high, medium, and low and then use the 360-degree nozzle to adjust the mist angle so it is perfect for your needs.

TaoTronics TT-AH001 Ultrasonic Cool-Mist Humidifier infographic of low, medium, high settings

TaoTronics TT-AH001 Ultrasonic Cool-Mist Humidifier controls detail

TaoTronics TT-AH001 Ultrasonic Cool-Mist Humidifier next to an alarm clock

Note: Do not add any essential oil or similar chemical perfumes in the water; they contain corrosive elements. This is not an essential oil diffuser unit. Only fresh clean water is suggested since this humidifer is used for water misting only. It is recommended to use distilled water since regular tap water puts minerals into the unit. Essential oils will cause long-term damage to the humidifier and might cause water leaks. Some people are allergic to these essential oil chemicals and may develop a medical condition.

The ultrasonic humidifier emits water vapor to moisten dry air. It will help stuffy noses, dry coughs, flaky dry skin, and sinus problems.

This exceptional unit filters out water calcium, magnesium ions, and microorganisms for a healthier pure mist. You can set the humidity control for the humidity you want in your area. Usually 30-60% is good, but 40% is best for the relative humidity setting for a good feeling. It will humidify rooms up to 538-square feet holding over a gallon of water and will run on a full tank of water all night or for 15 hours.

Ultrasonic humidifiers are very quiet so you will not be awakened in the night while sleeping. The two handles on the top and bottom make it easy to carry the unit to other places. This Ultrasonic humidifier is perfect in your home, office, bedroom, living room, bath, spa, and salons where you only want beneficial humidified air to breathe.

The unit comes with a User’s Manual and has a 1-year warranty and gift-wrap is available.

TaoTronics TT-AH001 Ultrasonic Cool-Mist Humidifier next to a smiling girl

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5. Honeywell™ Germ-Free Cool-Mist Humidifier, HCM-350

Our Rating: 4.5 out of 5 stars

The Honeywell™ white Germ-Free Cool-Mist Humidifier dispenses 99.9% germ-free mist that kills mold and mold spores, bacteria, viruses, and fungus with its patented germ killing technology. It uses ultraviolet (UV) technology to do this wonderful function for great benefits. With Honeywell’s QuietCare technology, it will operate up to 25% quieter and will run 24 hours with just one water reservoir filling holding 2 gallons. The unit is easy to clean, carry, and fill.

Honeywell HCM350W Germ Free Cool Mist Humidifier control close up

The Protec Antimicrobial treated filter provides an antimicrobial product to help maintain moisture balance in a small- to medium-sized room. The untreated tap water flows from the water tank into the UV water where UV light kills the microbes. The sanitized water enters the base to be absorbed by the wicking filter. The dry air in your room is drawn through the filter to absorb the moisture and dispersed into the air as a micro-fine invisible mist.

This Honeywell™ humidifier is perfect in your home, office, bedroom, living room, bath, spa, and salons where you only want beneficial humidified air to breathe.

The humidifier relieves dry, scratchy throats and dry nasal passages, winter-dry skin, as well as cracking and peeling skin. Low humidity causes furniture made of wood to lose its moisture and crack and shrink. Even houseplants are healthier with humidity. Humidification reduces static electrify in dry air. Heating costs are lower because your body feels warmer in moister air. Therefore, your thermostat can be set lower to save money.

This exceptional unit is dishwasher safe for removable parts. The self-regulating evaporative system will adjust the amount of moisture the air can hold.

The Honeywell™ comes with a User’s Manual and a 3-year limited warranty.

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Best Warm-Mist Humidifier Reviews

1. Vicks® Warm-Mist Humidifier with Auto Shut-Off

Our Rating: 5 out of 5 stars

Vicks® Warm-Mist Humidifier is a soft gray color that uses Vicks® Vaposteam, eucalyptus oil, or Kaz Inhalants to produce a medicated vapor that sooths sore throats, coughs, colds, flu symptoms, and sinus congestion. It is whisper quiet and will operate for 12 hours when filling with 1-gallon of water. This unit boils the water to become a steam vapor that is 96% bacteria free. By mixing with the room’s dry, air in the cooling unit it releases moist warm air for health benefits. It will cover from 1000- to 1200-square feet of room area.

To fill the container, turn it upside down in the sink and unscrew the cap, then fill with tap water, put the cover on and screw it tight. Distilled water is recommended however, to prevent build-up from minerals in hard water. Never use soft water; it uses salt. No filter is included in the unit, so do not use tap water.

The automatic shut-off, a soft glow LED night light does not turn off, and settings can be controlled for 2 comforting levels. A medicine cup is provided for adding the Vicks® medication. Just plug into a standard 110/120-Volt (not 220-Volt) outlet for immediate start up.

This Ultrasonic humidifier is perfect in your home, office, bedroom, living room, bath, spa, and salons where you only want beneficial medicated and humidified air to breathe when you are not feeling well.

The unit comes with a User’s Manual and has a 1-year warranty and gift-wrap is available.

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Best Cool- and Warm-Mist Humidifier Reviews

1. Levoit Hybrid Ultrasonic Cool- and Warm-Mist Humidifier with Remote

Our Rating: 5 out of 5 stars

The Levoit model number LV600HH is a combination unit to run warm- or-cool mist for everyone’s sick conditions. It holds a large amount of water being 6L (1.6 gallons), has an automatic shutoff when the water is gone, and is whisper-quiet so you can have a restful night’s sleep.

Levoit Hybrid Ultrasonic Cool- and Warm-Mist Humidifier with Remote essential oils dropYou can use your 100% pure essential oils with this humidifier by adding 8-10 drops into the aroma box. Enjoy and relax with aromatherapy and use eucalyptus and other oils for cold symptoms for yourself, baby, and kids. Make sure the lid on the box closes until it clicks to function correctly. It’s not the best unit for diffusing oils and it would be best to buy a dedicated essential oil diffuser.

This small aroma box space must be kept clean as well occasionally.

The Levoit has a remote-control unit, timer modes, reliable quality sensors, and will run 20- to 36-hours continually without refilling the reservoir. It covers 280-square feet with no problems. With an open floor plan, it can possibly cover the entire area.

Set the timer from 1- to 12-hours. The dual 360-degree spraying nozzles send mist in any direction you point the holes without needing to move the unit.

It’s best to clean it once a week and to replace the stale water with fresh water to avoid mold growth. The best cleaner is clear distilled vinegar and cotton swaps, rinse, air dry, and use again when you need it. Store when not in use in its original box with the instructions.

This unit is quite nice letting you select your relative humidity (RH) level 40% to 80%. The LED display panel is lit always, even in the dark. I don’t care what other people say about tap water! It is not good to use it because of the minerals and lime scale that clogs the unit. Only use distilled or purified water for easy cleaning and the best function this unit has to offer. Plus, tap water’s minerals become white dust to land on your furniture.

Levoit Hybrid Ultrasonic Cool- and Warm-Mist Humidifier with Remote infographic showing features

This unit is ideal for you, babies, kids, and your pets. The warm mist is touted for removing coughs and congestion, while the cool-mist opens nasal passages, sinuses, and keeps skin from being dry when the weather is hot or the furnace is running. Cool-mist is also great for coughs and congestion. It’s your preference because moisture is moisture and when the warm mist hits the air, it will be cool eventually.

Max Cool Mist Capacity: 300 mL/h
Max Warm Mist Capacity: 500 mL/h

The remote is very convenient in that it has the same function buttons as the unit. You can use it from a distance of 15-feet without waking up the kids to change the control functions.

The dimensions of the unit are 6.5-inches wide x 10-inches tall.

Levoit Hybrid Ultrasonic Cool- and Warm-Mist Humidifier with Remote controls close up diagram

This unit is applicable for any room in your home, at the office, or adding humidity to your greenhouse. There is no limit to where it can be used when you want to add moisture. Do not sit it on carpet, rugs, or the floor. It’s best on a table with something under it such as a plant pot bottom. Do not put towels under it. The unit needs to breathe and the fan must turn so there must be clearance from where you sit it.

Plug the UL® listed 110/120-Volt, 50/60 Hz cord into a USA outlet. Output power is 280-Watts, Outside the USA, Canada or Mexico buy a 220/240-Volt adapter.

Gift-wrapping is available. You will receive the hybrid humidifier, a remote control, 2 descaling pads, 2 aroma pads, a cleaning brush, a User’s Manual, and a 1-year Limited Warranty. The unit is made in China.

Levoit Hybrid Ultrasonic Humidifier LV600HH Description video.

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2. TaoTronics Ultrasonic Cool- and Warm-Mist Humidifier with Humidity Control

Our Rating: 5 out of 5 stars

The TaoTronics® humidifier model number TT-AH007 is a simple shaped unit made of white plastic to harmonize with any room in your home or office décor. The humidifier water reservoir holds 5.5L (186 ounces/5.8 quarts) misting for 16-hours. You can choose from the warm- or cool-mist settings for what you like best. The low water protection simply means it turns off automatically when the water level is very low. The LED lit digital touch screen is easy to use and program.

TaoTronics Ultrasonic Cool- and Warm-Mist Humidifier with Humidity Control diagram

Turn the unit upside down to fill it with distilled or purified water. City tap water is full of minerals and lime scale that is hard to clean and puts white dust on furniture.

The dimensions are 9.25-wide x 8.31-inches deep x 13.58-inches tall and weighs about 61 ounces (3.8-pounds).

It will cover a small area such as a bedroom, baby’s nursery, kitchen, or living room. Ideal for small offices with or without the door being closed. With the clever 360-degree nozzle on top, you can point the mist exactly where you want it, such as close to a sick child.

TaoTronics Ultrasonic Cool- and Warm-Mist Humidifier with Humidity Control infographic showing controls and features

With the handle on top, you can pick the unit up easily to take to another room or fill with more water.

Do not use essential oils, eucalyptus, additives, salt, or Vicks® VapoRub® in this unit. They will clog the humidifier, parts, and tubes making it worthless. Always discard the water each day because stale water will grow mold and bacteria.

What’s nice about this humidifier is its ability to control your humidity level with its rectangular hygrometer sensor on the cord. It measures the water vapor in the atmosphere. Be sure to keep the sensor away from water and moisture. Humidifying will be faster with warm mist and you can get to the humidity level you want 20% sooner than some of the other humidifiers using only cool-mist.  You will have 3 distinct levels to choose from.

TaoTronics Ultrasonic Cool- and Warm-Mist Humidifier with Humidity Control humididty sensor

The instructions show how to clean and remove parts in great detail. Clean the unit quickly and easily with clear distilled vinegar, citric acid, or rubbing alcohol using a cotton swab. Run any of the chemicals about 10 minutes, then run clear water about 10 minutes, and the residual gunk will disappear. Rinse well and air dry after you’re finished. Store the humidifier in its original box with instructions when not in use.

CE recyclable stampPlug the UL® listed 110/120-Volt, 50/60 Hz cord into a USA outlet. Outside the USA, Canada or Mexico buy a 220/240-Volt adapter. It does not use batteries.

Gift-wrapping is available for your family and friends. You will receive the humidifier a User’s Manual in English, German, French, Spanish, and Italian. All TaoTronics® products come with a 12-month full Warranty from the date of its original purchase. The unit is made in China.

TaoTronics Ultrasonic Cool- and Warm-Mist Humidifier with Humidity Control on table wiht woman driking coffee in background. Works best in small areas text across image

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3. Air-O-Swiss AOS 7147 Ultrasonic Humidifier - Warm- and Cool-Mist

Our Rating: 4.5 out of 5 stars

The whisper quiet digital Ultrasonic Air-O-Swiss humidifier generates micro-mist using high-frequency vibrations. The mist will diffuse at 104 degrees Fahrenheit when you choose the pre-heating function known as ITC (Intelligent Temperature Compensation). It monitors the temperature and automatically adjusts output changes that you select.

A cartridge to demineralize the water mineral residue is provided. Using distilled water will prevent mineral buildup. The humidifier is kept fresh and clean longer with the Hydro Cell that is included. When you use distilled water, you will not need to use the hydro cell demineralization cartridge and you will not need to replace it. There is no “filter” of itself. It attaches to the lid and the unit holds 1.3 gallons of water. You will have best results setting the relative humidity at 40% and will only need to fill it once a day when running in the all-day mode. Hard water from the tap builds up scale and minerals on the unit. If you notice a white dust in your home, it again is the minerals diffusing out.

Air-O-Swiss AOS 7147 Ultrasonic Humidifier - Warm- and Cool-Mist close up of humidity

This lovely diffuser will humidify a room up to 600-square feet. This Ultrasonic humidifier is lovely in your home, office, bedroom, living room, bath, spa, and salons. The surface touch controls are designed with you in mind to conveniently choose the functions you want. The timer can be set in advance for 1 to 8 hours or to run continuously. Select if you want a cool or warm-mist to maintain your desired room temperature.

The right humidity level is pre-determined when using the sleep mode. Gift-wrap is available when you give this to a friend or loved one. The product comes with a User’s Manual and a 1-year warranty.

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Top 3 Best Whole-House Humidifiers

1. Aprilaire® 700 Whole-House Humidifier Automatic Digital Control

Our Rating: 5 out of 5 stars

The fantastic Aprilaire® 700 whole-house humidifier is affordable for the complete job it does adding moisture to your entire house. It does require filters to remove dust and lint from entering the house, but they are very inexpensive. It puts out 0.75-gallons of moisture each hour. Set your humidity level at 40% so that windows do not condense with moisture.

The Aprilaire® 700 humidifier performs well. It has a built-in bypass damper for fewer parts to install. Additionally, it can be installed it its manual mode if you prefer. The unit has the bypass connection attached to the left side; however, it can be adapted to fit your requirements.

A professional HVAC (Heating Ventilation Air Conditioning) contractor must do the installation. This is a large humidifier and is not designed to diffuse essential oils of any sort. If you do so, you will ruin your furnace and duct work. Attempting to diffuse oils using this system will permanently damage your primary heating system.

The unit provides 50% more humidification compared to other units of the same type and size. It covers a home up to 4200-square feet. The digital control allows you to set the percentage of humidity. The ideal humidity level is between 30% and 60% for comfort and health. It is recommended you install the device in the air supply, but read the instructions for explicit placement details. Maintenance is low and easy to free up your time to do other things. Depending on the hardness of your water will determine how often you will change the filters.

You will have moisture in your wintertime dry home from running the furnace to help dry chapped lips. It also keeps wood furniture and floors from drying out. It uses the blower fan to disperse moisture into the air, so you will hear nothing since it makes no sound to begin with. The unit can be installed on a heat pump.

The humidifier is 16 by 11 by 18-inches and weighs 15.8 pounds. The power is 110/120-Volt, UL listed to a 24-Volt transformer.

The Aprilaire® 700 comes with a User’s Manual and a Limited 5-year Warranty when installed by a licensed HVAC contractor, otherwise the warranty will be void. Labor is not covered under the Warranty.

2. AIRCARE® MA1201 Whole-House Console-Style Evaporative Humidifier

Our Rating: 5 out of 5 stars

The gray console with 4 easy to roll casters is a great humidifier for an entire house up to 3600-square feet. AIRCARE® is made by ESSICKAIR®. The digital control provides extreme accuracy for maintaining an ideal level of humidity from 30% to 60% for health benefits, comfort, and to keep wood furniture and floors from cracking and drying out. It is an evaporative cool-mist humidifier with an output of 12-gallons. It disperses 3.9 gallons of water with the 4-speed fan to run it at low, medium, or high for an average run time of 36 hours. The tank holds 3.6 gallons of water. It has an adjustable humidistat.

The humidifier will automatically shut down when the humidity level is reached or when the water tank is empty. It has no pulley, belts, or wheels inside the unit to maintain. It is simple and easy to clean the mineral deposits from the wick. There will be no white dust or flecks with the filtering system. Simply remove the water tank located on the side. Check the filter indicator to see the status and roll to different rooms, as you need. If you have stubborn mineral build-up, use vinegar and water to remove.

One button turns the power off and on. Another button lets you set the humidity level and another button allows you to set the operation to automatic or manual. It runs quietly and you see an “F” when it’s time to refill the reservoir with water. For minimizing mineral deposits from hard water—calcium, lime, and scale—use a capful of S1708PDQ-U Humidifier Bacteriostat. It will be beneficial and save you some time. You can also purchase distilled water for about $1 a gallon at most stores.

The humidifier comes with a 6-foot power cord, and is UL listed. It will run on USA 110/120-Volts and the unit is ETL certified.

The unit is 20.5-inches high by 21.5-inches wide by 14.5-inches deep and weighs 13.5 pounds. The AIRCARE® MA1201 comes with a User’s Manual, a float, 4 casters, 1 wick (MAF1), and a 1-year Limited Warranty with 2-years Warranty on the motor.

3. Honeywell™ Cool Moisture Console Humidifier

Our Rating: 5 out of 5 stars

The HCM-6009 evaporative cool-mist HoneywellQuietCare™ has 2 tanks for ideal performance. It was designed and engineered for multiple rooms for comfort in large areas. The humidity level with this unit will be 30% quieter than other brands. The dual tanks have a wide opening top making it easier to fill and clean. The humidifier uses one tank of water at a time.

The high output design has adjustable humidity controls with multiple output settings. It will run for up to 24 hours on one water filling. Humidity will keep your lips from chapping, hands from cracking and drying, and congestion will be gone from nose and sinus mucous membranes. You can run it 24/7, since it has an automatic shut off when out of water. Therefore, you will have no worries about it burning up if you are not “watching” it. It does not have a thermostat because there is no heat. The humidistat is built in and is controlled by the humidity level you set. When that level is reached, it will shut off.

Clean out the water tray about once a week that collects pet hairs and dust when it runs. Turn the filter over every 3 to 4 days to extend filter life. The 2 ProTec™ balls with silver will kill anything having bad smells. Put one in the hole of each water tank. When you do not use the unit daily, the stale water can smell and grow mold, mildew, and bacteria.

The water flows from the tanks into the water tray where it is absorbed by the ProTec™ treated filter. The adjustable humidistat turns the humidifier on and off automatically at the preset humidity settings done by you. There are 3 speed settings for adjusting the moisture level and sound intensity. The convenient “humidity reached” and “tank empty” will be helpful at a glance. The wicking filter will remove water impurities and reduce white dust and flecks from landing on your furniture. The ideal humidity level is between 30% and 60% for comfort and health. At 80%, your windows will drip moisture and mold will grow. The air blows out of the front and sides. Keep it 2-feet away from walls, since it must breathe.

The humidifier is manufactured in Southborough, Maine, and any repairs are done in Memphis, Tennessee. The Honeywell™ is made by the American company, Kaz, Inc., that manufacturers products under the brands of Honeywell™, Vicks®, Envirocare, and more.

It will run on USA 110/120-Volts, 50/50 Hz, UL listed, using a 240-Volt adapter for those outside the USA.

The dimensions are 23.2 by 15 by 17.5-inches and weighs 20 pounds. The Honeywell™ comes with a User’s Manual, filter, and a 3-year Limited Warranty.

Things to Keep in Mind when Choosing the Right Humidifier

The right humidifier for you depends on where you are going to use it and what you want to accomplish with it. Do you live in a dry climate and need humidity? Do you occasionally have sick children that will benefit from humidity? Do you have health problems from the lack of humidity? Do you have annoying static electricity and dust in your home?

You will want to keep in mind several things: performance, features, design, service, and warranties.

Performance—Most humidifiers express the output of humidity in gallons of water used in a 24-hour period. They are also evaluated by how many square feet will be humidified. You will need to buy a humidifier for the correct space of your room or house. When your air is too humid, over 60%, the conditions are right for growing mold, mildew, and bacteria.

Features—Ultrasonic humidifiers provide both warm and cool output. This type unit uses cold water that is passed over a heating element to become warm. When the water is warm, a mist leaves the Ultrasonic unit at a safe 104 degrees Fahrenheit. The water inside the unit could burn a child if it is tipped over. Evaporative warm-mist humidifiers heat the water to boiling. It is safer to use cool-mist humidifiers around young children, infants and the elderly.

Hygrostats and/or humidistats that measure the humidity in the air are provided on the best humidifiers. These help you to know the moisture level you want without guessing what the output is.

Design—If you know where you want to put the humidifier, measure the unit to see if it will fit your space. Your humidifier of choice should be easy to carry to the sink for water refilling. It would need to have handles for gripping when it is wet.

Service and Warranties—Most humidifiers typically come with a 1-year warranty. Purchase from a company that backs their products for a longer time. Be sure the company provides a toll-free number or live chat for support. You will want to select a reputable company providing customer support assistance.

How to Choose the Right Humidifier for Your Home

Humidifiers benefit the comfort level of your home. The right choice will satisfy all of your needs. They are not expensive and easy to use. Here are some specific guidelines for choosing your perfect humidifier:

Square Footage—It would be overkill to retrofit a humidifier to an existing furnace if all you need is a humidifier in one room occasionally. A smaller portable humidifier will easily provide the comfort level you need and save you money. To figure square footage multiply the width by the length of the room. If a room is 12 W x 10 L it will be measure 120 square feet.

Running costs—Whole house furnace humidifiers are more expensive to initially install but cost the least over the years. Warm-mist vaporizers are cheap to buy but are the worst energy hogs. This is because the water must be evaporated by first boiling it. Unnecessary usage can be better controlled when using a humidistat for running time. Replacement filters, wicks, or cartridges are another cost to consider. The replacement cost can make this unit not cost-effective.

Humidistat—is an important dial or digital device and might include a hygrometer for detecting moisture, to display the humidity level and to shut the humidifier off. Humidistats are important since a unit without a gauge will continue to put mist into the air until it is manually shut down. Since humidistats are not very accurate allowing condensation to form on windows, and create mold and mildew, it is best to have a portable hygrometer.

Noise—the warm-mist tabletop humidifier barely makes any noise except for a slight boiling and hissing. Evaporative humidifiers create as much noise as a small window air conditioner or as much as a vacuum cleaner. The larger evaporative console models are used for larger areas; they will be best placed away from sleeping areas because of their noise.

Water Quality—when hard water from the faucet is used, many humidifiers will have a lower output of mist. They usually require more costly maintenance. Distilled water might be worth it, but that is an additional cost as well.

Safety—purchase a humidifier that automatically turns off when the reservoir is empty. There are models that will beep when the water is low and needs refilling. A reservoir that is transparent will show you when water is needed.

Warm or Cool—some people prefer cool-mist feeling that warm-mist is the same as breathing inside a sauna. Others like the soothing warmth of the warm-mist saying it makes the air feel soft. It is a personal choice and your doctor can recommend which one is best for a medical problem. If you use a vapor medication, such as Vicks®, the moist warm-mist vaporizers are the way to go.

Easy Steps to Finding the Best Type of Humidifier for Your Home Infographic

Humidifiers - Frequently Asked Questions

Humidifiers are essential during the cold winter months, in dry climates, or yearlong. Humidity in the air makes the air warmer and more comfortable—that ‘chill’ will be gone. It is easier to breathe and humidifiers add that much needed moisture to your living environment. Do not be confused with de-humidifiers—they remove moisture from the air.

Be sure to keep the box your humidifier came in to store it when it is not in use. Date the box so you will know when you received it. Be sure to keep the User’s Manual and any other instructions or papers in a place you can quickly find. You could put them all together in a plastic bag with the sales receipt in a handy spot.

By using a humidifier, you will improve dry cracked skin, nosebleeds, congestion, and sinus problems. To be enlightened about what to know when purchasing a humidifier—what type, how they operate, how to clean, and what to expect—we have listed frequently asked questions for your knowledge.

What is the difference between cool-mist and warm-mist humidifiers?

There are not too many differences. A cool mist humidifier makes breathing easier for allergy, asthma, and respiratory problems. If you breathe easier in a steam-filled bathroom or when the humidity is high when it is raining, a warm mist would be better. If it were harder to breathe with lots of humidity, a cool-mist would be better. The warm mist uses a heating element to boil water for a steamy vapor where a cool mist unit does not. A warm-mist might not be the best consideration with young children and pets since it has a heating element. The cool mist disperses its mist at room temperature.

Should I run my humidifier day and night?

Yes, humidifiers run 24/7 to keep the moisture at a perfect level in your home.

Do humidifiers come with germ and bacteria options?

There are humidifiers in the marketplace that have built-in features to either reduce or prevent bacteria from growing in the water tank and at that the output device emitting the moisture. Some humidifiers use Nano or silver eon technology and are more expensive. You will still have to clean, demineralize (hard water), and disinfect the unit to keep the growth at a minimum. Even though these units cost more, they are well worth it and lengthen the life of the humidifier. You will probably only find Nano-silver technology in the specifications rather than in the unit’s description.

Is it okay to add salt to the water to have an ocean type salt spray?

No. Do not add salt to a humidifier. Salt is corrosive and it will ruin metal pieces, seals, filters, and decrease the life of the humidifier. You can corrode the heating element in a warm mist unit. It can be a fire danger from overheating. Water with salt in it boils at a higher temperature. The circuit breaker can trip or a fuse can blow. You will void your warranty doing so.

What size humidifier should I buy for my bedroom?

Measure your bedroom or other rooms you want to humidify. Measure the length by the width (feet), and multiply for square feet: A 10×12 room = 120-square feet. A 15×15 room = 240-square feet. A 700- to 900-square foot size unit would do well. Manufacturers vary in terms of square feet. By using the highest output on your humidifier, you will have the best running operation for your room.

When will I need to add more water to a 2- to 3-gallon humidifier?

You will probably need to refill the water tank after about 12 to 16 hours of operation contingent upon if you run it 24/7 and on high or low. You will typically refill the water reservoir each morning or evening. Do not go to sleep with the unit low on water; make sure it is full up for sleeping.

Why does my cool-mist humidifier not make any mist?

Some humidifiers create a mist that is invisible and you might have this type. If your humidifier is running and the water level is going down, then the unit is taking in air, and it should put out a mist that is invisible. Check your Owner’s Manual to verify your unit’s operation manner.

When do I clean my humidifier?

Be sure to read your User’s Manual. It should be cleaned on a regular basis to stop mildew, mold, fungus, and bacteria from growing. Never let the water sit in your humidifier because standing water will grow pathogens. A good rule of thumb is to empty the water daily. Maintaining that practice means you can thoroughly clean and disinfect every week or so, rather than daily. That is easy and quick to do so that you do not inhale contaminated mist. Follow the manufacturer’s instructions for doing this procedure. You will want to remove mineral deposits if you use hard water. Distilled water is always best to use to keep your humidifier in great shape.

Can I put a timer on my humidifier to have it shut off?

Yes. However, many of the new humidifiers have built-in programmable timers digitally controlled. This lets you run it when needed saving you energy as well. Humidifiers with a countdown timer lets you program it when it is currently operating to shut off. If you do not have this type of unit, you can use a timer set at the number of hours to run safely.

How much energy does a humidifier use?

It is hard to tell how much energy a humidity will use. It is not expensive to run a humidifier, so check your electric statement.

  • Cool-mist humidifiers have the ability to moisturize larger areas and use less energy than the warm mist units.
  • Warm mist humidifiers heat the water so will use a little more electricity that the cool mist units. They release a warm invisible mist into your room.
  • Larger tabletop units use less energy than console humidifiers running all day.
  • Whole-house humidifiers attached to your furnace’s ductwork use the least amount of power and are the most efficient.

Are humidifiers loud?

Ultrasonic humidifiers have less noise because they produce ultrasonic sound waves. Ultrasonic sound is above the frequencies we hear, so these units are quiet. Evaporative units use built-in fans to emit the mist and will have the loudest sound because of the moving parts. Warm mist humidifiers do not use a fan so are less loud than cool mist. You will become used to the sound as a white background noise and with a television or music on, you will not hear it.

What is the white dust on my furniture, floor, and around my humidifier?

White dust is a result of minerals naturally found in hard water. It is not harmful, is as easy to clean as you would clean any dust. It is sometimes released into the air from humidifiers. Warm moisture steam humidifiers and evaporative cool misting humidifiers do not release white flecks and dust. Ultrasonic humidifiers can release dust if they do not have a demineralization cartridge to trap minerals before they enter the misted air. Use distilled water if white dust is a concern. Distilled water will not make white dust, you will not have to remove mineral deposits from your unit, your filter will last longer, and you will not need to clean it as frequently. You still have to change the water every few days and disinfect pursuant to the manufacturer’s instructions.

Can I use hard water in my humidifier?

Be sure to check your User’s Manual, since different brands and humidifier types have different requirements. If you do not own a humidifier and are planning to purchase one, buy one that has a mineral cartridge. Hard water from the tap or well has minerals that can collect inside the unit. The mist might contain white flecks and dust around the humidifier area caused by minerals. When you inhale white dust over time, it can exacerbate respiratory conditions or trigger new problems. The cartridges in units with one attract and take in the minerals from hard water for less of a chance to breathe the white dust in. If your existing unit does not have a mineral cartridge, it is best to use distilled water that has no minerals.

I have a full-face CPAP mask. Will I need more water in my humidifier during the night?

If you use CPAP (Continuous Positive Airway Pressure) therapy, this machine helps a person who has obstructive sleep apnea (OSA) breathe more easily during sleep. A full-face mask should not change the water amount used in your unit at night or any other time. If you have air leaks around your mouth, you will lose air and moisture via your mouth. Warm humidity will not wear out your masks and hoses. The tubing included with the unit can withstand much higher temperatures than the slight heat produced by the humidifier.

Final Thoughts

Humidifiers of any type put large amounts of moisture (humidity) into a larger area of space and can operate for longer periods. Humidifiers are made of sturdy metal or thick plastic and are large in size and use great amounts of water.

Diffusers, however, are small glass, plastic, or ceramic devices about the size of an apple up to the size of a 5-pound bag of sugar. It would take 6 to 10, 5-pound bags of sugar to equal a small room humidifier’s size for dispersing humidity when a child is sick.

A personal diffuser can fit into a purse or satchel when traveling because they are so small, and some of the larger ones can sit on top of a table in a more limited to a small area. A diffuser can be a very small humidifier emitting a mist only from water. They are primarily used as aromatherapy essential oil diffusers for misting a lovely fragrance into the air having therapeutic benefits for colds, sore throats, dry coughs, dry flaky skin, sinus irritation, and dry mucous membranes in the nose. They also help those suffering from hay fever, allergies, asthma, and respiratory problems. The diffusers use the components of nature’s plants that are known to have healing powers.

Some people have no need for the moist (humidity) essential oil’s benefits, so they use the fragrance from the diffuser to make their home’s specific rooms, office, spa, or hair salon smell wonderful all day. Some boutiques use diffusers with lavender oil to have their shop smell great when customers drop in.

There you have it. Bulky humidifiers are for sizeable areas and diffusers are for local small area spaces. Humidifiers can operate longer with larger amounts of water consumed, and diffusers operate for shorter periods needing to be refilled with water more often. Some of the latest more advanced diffusers can run up to 15 hours without a refill and that is because the small units have larger reservoirs for holding water. They will typically cover 200- to 1000-square feet.

Both humidifiers and diffusers produce moist vapors into the air. One is simply bigger than the other is.