The Best Filterless Humidifier for Your Home

The best filterless humidifier helps maintain optimal humidity levels in your living space while providing comfort for allergies and dry air.

By Erica Reagle | Updated Feb 26, 2021 2:29 PM and its partners may earn a commission if you purchase a product through one of our links.

The Best Filterless Humidifier Options


It can be frustrating and uncomfortable when your living space experiences a decrease in the humidity level. Especially during the colder winter months when space heaters reign supreme, indoor air is sapped of moisture, and you’re left with dry and cracked skin, peeling lips, and allergy symptoms. A humidifier can help, and—in particular—a filterless humidifier infuses moisture into the air without the inconvenience of having to continually replace a filter.

A filterless humidifier releases cool mist into the air through ultrasonic vibration to achieve comfortable indoor humidity levels. This cool mist adds moisture to indoor air to protect against dry skin, allergies, congestion, and even to keep plants healthy. Some filterless humidifiers also have a warm mist setting, and others use essential oils for aromatherapy. Additionally, many filterless humidifiers offer a variety of features like adjustable mist levels, rotating nozzles, and built-in safety options.

The best filterless humidifier can infuse a dry environment with much-needed moisture, providing not only cool mist but convenience. This guide will explain the important features to consider when choosing the best filterless humidifier for your home and then review our selections for some of the top products on the market.

  1. BEST OVERALL: Everlasting Comfort Cool Mist Humidifier
  2. RUNNER-UP: Pure Enrichment MistAire XL Ultrasonic Cool Mist
  3. BEST BANG FOR THE BUCK: raydrop Cool Mist Humidifier
  4. BEST FOR SMALL ROOMS: Vicks Mini Filter-Free Cool Mist Humidifier
  5. BEST FOR LARGE ROOMS: LEVOIT Humidifier for Large Room
  6. HIGH-TECH PICK: TaoTronics Humidifier for Bedroom
  7. MOST QUIET: Homech Cool Mist Humidifier, 26dB Quiet Ultrasonic
  8. BEST FOR AROMATHERAPY: GENIANI Top Fill Cool Mist Humidifier
The Best Filterless Humidifier Options


What to Consider When Choosing the Best Filterless Humidifier

Choosing the best filterless humidifier for your home depends on a variety of important factors. Think about the type of mist you want the humidifier to emit, the amount of water the humidifier will hold, the size of room the humidifier is intended to service, how long the humidifier can run before you’ll need to refill it, and more. Keep reading to learn about these and other unique features.

Mist Type

The three main types of mist for a filterless humidifier are warm, cool, and a combination. Warm mist units provide a subtle warming effect, and the heated water can also eliminate some bacteria. Cool mist units operate around room temperature while releasing unheated water into the air. Warm/cool combination units feature different settings for warm mist and cool mist.

Tank Capacity

Tank capacity refers to the volume of water a filterless humidifier can hold before requiring a refill. Most filterless humidifiers have a capacity between 1.5 to 6 liters of water. Small-capacity tanks are suitable for a few hours of use in smaller spaces, whereas large-capacity tanks are a better option for extended—including overnight—use in larger spaces.

Coverage Area

Coverage area is an important consideration when choosing the best filterless humidifier. Some manufacturers indicate the maximum square footage for which a humidifier is designed. Other manufacturers simply indicate if the humidifier is more suited for small or large spaces. Make sure the coverage area of the humidifier aligns with the space. Using too large of a humidifier can add excess moisture to a room and create mold, whereas a humidifier that is too small for the space will not have the desired effect of reducing dryness in the air.


Runtime measures how long a filterless humidifier can operate before the tank needs to be refilled with water; it varies based on tank capacity and how quickly the unit dispenses mist. Some humidifiers feature adjustable settings, such as the mist level, that can impact the runtime. Using a humidifier on a high setting usually requires more water, which then reduces the runtime.

Humidistat & Timer

A humidistat is an essential component of a filterless humidifier. It prevents the moisture created by the humidifier from exceeding a certain level. Units without humidistats sometimes produce too much humidity, which can cause negative health effects and increase the likelihood of mold growth. Some humidifiers have built-in timers that are programmable, allowing you to turn them on and off based on the humidity level.

Noise Level

A filterless humidifier is typically quieter than a filtered or evaporative humidifier because it uses ultrasonic technology instead of fans to circulate humidity. As a result, this type of humidifier can be a good option for bedrooms and nurseries. When using a humidifier in an area with more activity, such as a kitchen or a game room, noise level might not be an important factor.

Additional Features

Some filterless humidifiers include extra features, such as smart technology, adjustable spray, LED displays, and added safety options. Humidifiers with adjustable and rotating spray nozzles allow for varying mist levels. Some humidifiers provide built-in sensors that automatically adjust the humidity level based on the surrounding environment. Others feature LED screens that show the humidity level.

Most filterless humidifiers include an automatic shut-off function, which means they will turn off when the water level is low or the water tank is removed. Some high-tech models include a remote control to easily adjust the settings from across the room. Other filterless humidifiers provide a well or a tray to add essential oils that create a pleasant aroma and provide health benefits, such as improving relaxation.

Our Top Picks

Our top picks offer a selection of filterless humidifiers that include many of the above-mentioned features, such as adjustable mist levels, auto shut-off functions, and built-in timers, in addition to considering overall quality and affordability. Read on to discover some of the best filterless humidifiers for the home.

Best Overall

The Best Filterless Humidifier Option: Everlasting Comfort Cool Mist Humidifier

This filterless humidifier from Everlasting Comfort boasts a large 6-liter tank capacity and a runtime of 50 hours, making it well-suited for spaces as large as 500 square feet. It features a high cool mist output to ensure plenty of moisture for a space, and the humidifier doubles as a diffuser when essential oils are added to the attached tray.

The humidifier includes an auto shut-off function and operates at less than 30 decibels, so it’s a safe and quiet choice for use near babies and young children. It also provides a convenient blue LED night light for overnight use. Choose from a black or white plastic finish.


The Best Filterless Humidifier Option: Pure Enrichment MistAire XL Ultrasonic Cool Mist

Featuring a 3.7-liter tank capacity, this filterless humidifier from Pure Enrichment is suitable for use in rooms as large as 500 square feet. It can continuously operate between 10 and 24 hours, depending on the mist setting. A rotating mist control knob adjusts the moisture level for optimal comfort. The humidifier features single- and dual-mist nozzles that can be rotated 360 degrees to control the direction of the mist.

An optional nightlight can be switched from blue to green to red, providing muted color to a room during the overnight hours. Equipped with an automatic shut-off function, the humidifier powers down when low water levels are detected or the water tank is removed. It also includes a cleaning brush for easy maintenance.

Best Bang for the Buck

The Best Filterless Humidifier Option: raydrop Cool Mist Humidifier

This filterless humidifier has a vertical oval design and a compact 1.7-liter tank capacity, so it’s suitable for small spaces. With a runtime of 10 hours, it features a dial knob control for adjusting the cool mist output based on the desired moisture level. Additional features include whisper-quiet operation under 32 decibels, an LED indicator, and an auto shut-off function, making this humidifier a significant value.

Best for Small Rooms

The Best Filterless Humidifier Option: Vicks Mini Filter-Free Cool Mist Humidifier

With a .5-gallon (1.89-liter) tank capacity and weighing just 3 pounds, this mini filterless humidifier from Vicks is ideal for small spaces like nurseries and home offices. It features an adjustable cool mist output control, an auto shut-off function, and 20 hours of runtime.

The translucent tank makes it easy to monitor water levels and is available in three colors, while the large opening provides easy access for cleaning. This humidifier provides extra comfort and relief during cold and flu season when used with Vicks VapoPads.

Best for Large Rooms

The Best Filterless Humidifier Option: LEVOIT Humidifier for Large Room

Designed for use in large spaces, this filterless humidifier from LEVOIT boasts a 6-liter tank capacity and a dual cool/warm mist output of up to 500 mL/hr. Ideal for spaces up to 753 square feet, it features a 60-hour runtime at the low level. The humidifier provides an auto shut-off function and a sensor that automatically adjusts the mist level to maintain optimal humidity.

It also offers an aroma box for essential oils, a remote control, and a 1- to 12-hour timer for added convenience. Additional features include ultra-quiet operation and a wide tank opening for efficient cleaning.

High-tech Pick

The Best Filterless Humidifier Option: TaoTronics Humidifier for Bedroom

This filterless humidifier from TaoTronics will satisfy the techie in the household. It offers customized humidity levels with a maximum mist output of 550 mL/hr. The dual cool/warm mist humidifier also boasts automatic humidity monitoring, which automatically powers the unit on and off to maintain an optimal indoor humidity level. The remote control adjusts all features from afar, such as the mist level and temperature, the humidity level, and timer functions.

Additional features include whisper-quiet operation, sleep mode, a 9-hour timer, an LED display, and a wide, top-fill opening. The humidifier also provides an essential oil diffuser for aromatherapy. It boasts a 6-liter tank capacity and 60-hour cool mist runtime to easily accommodate rooms as large as 753 square feet.

Most Quiet

The Best Filterless Humidifier Option: Homech Cool Mist Humidifier, 26dB Quiet Ultrasonic

This filterless humidifier from Homech operates at just 26 decibels, ensuring quiet operation in rooms like nurseries, bedrooms, and home offices. It provides a 4-liter tank capacity and 12 to 50 hours of runtime, depending on the selected mist level. The humidifier is intended for rooms ranging from 215 to 430 square feet. A 360-degree rotating nozzle can distribute mist up to 2 feet high for maximum coverage.

A low-water warning function will automatically shut off the humidifier when the water level is low. With a convenient carrying handle and a wide opening for efficient cleaning and filling, this humidifier is also easy to operate and transport.

Best for Aromatherapy

The Best Filterless Humidifier Option: GENIANI Top Fill Cool Mist Humidifier

This filterless humidifier from GENIANI serves a dual purpose; it not only emits cool mist but is also an essential oil diffuser for aromatherapy. It features a built-in sensor that maintains an optimal humidity level while delivering cool mist via low, medium, and high settings. The humidifier boasts a 4-liter tank capacity and 18 hours of runtime on the highest mist setting, making it ideal for rooms as large as 220 square feet. Additional features include an automatic shut-off function, a water gauge, a night light, and quiet operation at 38 decibels. Choose from a white or black plastic finish.

FAQs About Filterless Humidifier

Before selecting the best filterless humidifier for your home, review these frequently asked questions and answers about various aspects of filterless humidifiers.

Q. Should I run my filterless humidifier all night?

Yes, it is perfectly safe to run a filterless humidifier at night as long as the current humidity level is not too low. Humidifiers can help eliminate dry air and prevent congestion during the night.

Q. How do I maintain my filterless humidifier?

A filterless humidifier is easier to maintain than a filtered humidifier, but it still requires regular cleaning to prevent the growth of mold or bacteria in the tank or tube. Clean it with a sponge or brush, unless it is a model with a self-cleaning feature.

Q. How long do filterless humidifiers work between refills?

Filterless humidifiers can provide mist for between 10 to 50 hours at a time, depending on the mist level and tank capacity.