The best cool mist humidifier depends on listed floor area, run time per fill and how easily the tank is cleaned.
We compared five cool mist models, from a nightstand-size unit to a 4.2-gallon whole-room model. See also our best affordable humidifier and best humidifier for bedroom roundups. Every pick comes from the makers’ specifications on each Amazon listing, not our own testing, and our Editorial Policy explains how we work. Clean the tank as each maker directs and use the water type it recommends.
Our Top 3 Picks for the Best Cool Mist Humidifier
DREO HM311 ultrasonic cool mist top-fill humidifier
- Modular top-fill tank that is removed for cleaning
- Runs up to 36 hours per fill
- Listed noise level of 28dB
Lacidoll 4.2-gallon cool mist humidifier for large rooms
- Over 4.2 gallons of capacity with a listed 1,500 square feet
- Wide top opening for pouring water straight into the tank
- Humidity can be set from 40% to 90% with a built-in humidistat
Livatro stainless steel cool mist humidifier
- 304 stainless steel tank that can go in the dishwasher
- Wide-opening top-fill tank
- Listed noise level of 24dB
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Cool Mist Humidifiers Compared
| # | Product | Key Features | |
|---|---|---|---|
| 1 |  DREO HM311 ultrasonic cool mist top-fill humidifier |
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| 2 |  Lacidoll 4.2-gallon cool mist humidifier for large rooms |
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| 3 |  Livatro stainless steel cool mist humidifier |
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| 4 |  Levoit Dual 150 top-fill cool mist humidifier |
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| 5 |  ROSEKM compact cool mist humidifier |
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1. DREO HM311 ultrasonic cool mist top-fill humidifier
Best Overall
- Modular top-fill tank that is removed for cleaning
- Runs up to 36 hours per fill
- Listed noise level of 28dB
- Touch control with adjustable humidity control
- Lists 300 square feet, less than Lacidoll Large Room, Livatro Stainless and ROSEKM Compact
- Listed noise level: 28dB
- Tank capacity: 4 liters
- Weight: 3.1 pounds
Mist rises up to 40 inches tall from a 4-inch mist outlet.
A night light and aroma diffuser are built in, though essential oils are not included. An aroma pad, cleaning brush and cleaning guide come with it.
Good match for the DREO HM311
Shoppers who want a top-fill ultrasonic unit with a removable modular tank and touch control.
When to choose another pick over the DREO HM311
Skip it if you want more floor area, since Lacidoll Large Room lists 1,500 square feet.
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2. Lacidoll 4.2-gallon cool mist humidifier for large rooms
Best for Big Spaces
- Over 4.2 gallons of capacity with a listed 1,500 square feet
- Wide top opening for pouring water straight into the tank
- Humidity can be set from 40% to 90% with a built-in humidistat
- Remote control and touch control
- Listed noise level is 35 dB, higher than DREO HM311 at 28dB, Livatro Stainless at 24dB and ROSEKM Compact below 26 dB
- Listed noise level: 35 dB
- Power use: 50 watts at 120 volts
- Dimensions: 11"D x 11"W x 26"H
It offers 4 mist speeds plus intermittent mist at 30s, 60s and 90s.
An extension pipe, a 360-degree nozzle, an aroma diffuser tray and a night light are included. The maker recommends distilled or purified water.
Good match for the Lacidoll Large Room
Shoppers who want one large cool mist tank for a big room.
When to choose another pick over the Lacidoll Large Room
Skip it for a nightstand, since ROSEKM Compact has a 5.1 by 5.1 inch footprint.
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3. Livatro stainless steel cool mist humidifier
Best Easy-Clean Tank
- 304 stainless steel tank that can go in the dishwasher
- Wide-opening top-fill tank
- Listed noise level of 24dB
- Timer from 2 to 14 hours
- Offers two mist settings, fewer than ROSEKM Compact with 4 mist levels and Lacidoll Large Room with 4 mist speeds
- Listed noise level: 24dB
- Timer: 2 to 14 hours
- Tank: 304 stainless steel
A 7-color LED light ring can also be turned off.
An auto clean function is listed for the tank.
Good match for the Livatro Stainless
Shoppers who want a stainless steel tank that is simple to clean.
When to choose another pick over the Livatro Stainless
Skip it if you want a built-in humidistat, since Lacidoll Large Room lists one.
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4. Levoit Dual 150 top-fill cool mist humidifier
Best Base Oil Chamber
- Top-fill design with no need to flip the tank
- 360-degree nozzle that directs the mist
- Essential oil diffuser that takes 10 to 15 drops in the base chamber
- Includes a cleaning brush and water filter sponge
- Lists 290 square feet, the smallest floor area of the five picks
- Fill style: Top fill
- Power use: 25 watts at 120 volts
- Weight: 3 pounds
The listing gives a 3-liter tank and a 25-hour runtime.
It measures 7.2 inches deep, 8.11 inches wide and 11.57 inches tall.
Good match for the Levoit Dual 150
Shoppers who want a top-fill unit with an oil chamber and a 360-degree nozzle.
When to choose another pick over the Levoit Dual 150
Skip it if you want a timer, since Livatro Stainless lists a 2- to 14-hour range.
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5. ROSEKM compact cool mist humidifier
Most Compact
- Footprint of 5.1 x 5.1 inches
- Listed noise level below 26 dB
- 4 mist levels set by touch
- Filter-free design with a removable tank
- Lists 320 square feet, less than Lacidoll Large Room at 1,500 and Livatro Stainless at 500
- Listed noise level: Below 26 dB
- Power use: 18 watts at 110 volts
- Dimensions: 5.1"D x 5.1"W x 10.2"H
The indicator turns off after 10 seconds, and a 360-degree nozzle directs the mist.
It uses 18 watts at 110 volts and stands 10.2 inches tall.
Good match for the ROSEKM Compact
Shoppers with a nightstand or desk who need a small footprint.
When to choose another pick over the ROSEKM Compact
Skip it if you need more floor area, since Livatro Stainless lists 500 square feet.
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How to Choose the Best Cool Mist Humidifier
- Match floor area to your room, since these picks list 290, 300, 320, 500 and 1,500 square feet.
- Compare noise figures, which run from 24dB on Livatro Stainless to 35 dB on Lacidoll Large Room.
- Think about cleaning, because the Livatro Stainless tank can go in the dishwasher and the DREO HM311 tank is modular.
- Check run time on both settings where listed, such as 24 hours on low and 10 on high for ROSEKM Compact.
- Pick the control style you like, such as touch on DREO HM311 or remote and touch on Lacidoll Large Room.
Frequently Asked Questions
Which pick has a tank that can go in the dishwasher?
Livatro Stainless. Its 304 stainless steel tank is listed as dishwasher-compatible.
Which pick lists the lowest noise level?
Livatro Stainless lists 24dB. ROSEKM Compact is next at below 26 dB.
How long can one fill last?
ROSEKM Compact lists up to 24 hours on low. DREO HM311 lists up to 36 hours and Levoit Dual 150 lists 25.
What water should I use?
Follow each maker’s directions. The Lacidoll Large Room maker recommends distilled or purified water.
The Bottom Line
Our best cool mist humidifier pick is the DREO HM311 for its modular top-fill tank and touch control. Choose Lacidoll Large Room for big spaces, Livatro Stainless for a stainless steel tank and ROSEKM Compact for a nightstand.
Best Overall: DREO HM311 ultrasonic cool mist top-fill humidifier Check Latest Price
Best for Big Spaces: Lacidoll 4.2-gallon cool mist humidifier for large rooms Check Latest Price
Best Easy-Clean Tank: Livatro stainless steel cool mist humidifier Check Latest Price
Check each listing for current details before you decide.
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