Best Filterless Humidifiers of 2022

Minimal maintenance costs and low noise levels.

If you’re experiencing the consequences of dry air, such as chapped lips, dry skin and throat, you could use a humidifier.

Humidifiers work effectively at bringing much-needed moisture back into your indoor air. Furthermore, they help to balance the humidity to keep it at a comfortable level.

There are different types of humidifiers, mainly filtered and filterless. Filterless humidifiers are favored by many homeowners due to minimal maintenance costs and low noise levels. In this guide we’ll teach you everything you need to know about the best filterless humidifiers.

Our Top Picks

Oh So Spotless earns a commission through the following independently chosen links at no additional cost to you.
Product Comparison Table

Product Image of the LEVOIT Humidifiers for Bedroom Large Room Home, Smart Wifi Alexa Control, 6L Top Fill Cool Mist for Baby and Plants, Ultrasonic, Essential Oil Diffuser, Customized Humidity, Night Light, Quiet, Gray
Best Overall Pick
Levoit Cool Mist Humidifier
  • Long-lasting
  • Excellent coverage
  • Excellent noise reduction
Product Image of the Dreamegg Cool Mist Humidifier - Ultrasonic Humidifiers for Bedroom, Baby & Home, Whisper Quiet Filter-Free Air Humidifier with 360° Mist Nozzle, Timer Setting, Night Light Option & Auto Shut-Off
Quietest Humidifier
Dreamegg Cool Mist Humidifier
  • Quiet
  • Long-lasting
  • Easy to clean
Product Image of the GENIANI Top Fill Cool Mist Humidifiers for Bedroom & Essential Oil Diffuser - Smart Aroma Ultrasonic Humidifier for Home, Baby, Large Room with Auto Shut Off (4L, White)
Best Large-Capacity Humidifier
Geniani 4L Ultrasonic Humidifier
  • Extra large capacity
  • Easy to clean
  • Oil diffuser feature
Product Image of the Everlasting Comfort Ultrasonic Cool Mist Humidifier for Bedroom (6L) - Lasts 50 Hours With Essential Oil Diffuser Tray - Quiet, Filterless Large Room Humidifiers - Small Air Vaporizer for Baby, Kids & Nursery
Best Humidifier Diffuser Combo
Everlasting Comfort Humidifier
  • Large capacity
  • Aromatherapist
  • Auto-shutoff
Product Image of the Vicks Filter-Free Ultrasonic Cool Mist Humidifier, Medium Room, 1.2 Gallon Tank-Humidifier for Baby and Kids Rooms, Bedrooms and More
Best Compact Humidifier
Vicks Ultrasonic Cool Mist Humidifier
  • Compact
  • Large capacity
  • Quiet

Why Use a Filterless Humidifier?

You may be wondering why you would choose a filterless humidifier over a filtered one, considering the risk of impurities. However, filterless humidifiers are sometimes cleaner than their filtered cousins. This is because the filter in the filtered model can get very dirty and if not replaced regularly, it can contaminate the mist.

Now, this doesn’t mean filterless humidifiers emit dirty mist. Due to new technologies, these humidifiers can clean the moisture before it leaves the nozzle. Here are a few other advantages of filterless humidifiers:

  • Quiet: Most filterless humidifiers use ultrasonic technology to create a fine mist. This is much quieter than evaporative units. The lack of filters also makes them quieter.
  • Easier maintenance: Filters become dirty and eventually need to be replaced or cleaned. Removing the filter can be rather tricky, depending on the type.
  • Cheaper: Although the initial price might be the same as a filtered humidifier, you’ll save in the long run. You’ll be ditching the expensive cost of replacing filters regularly.

Filterless Humidifiers Need Cleaning

It’s still crucial to clean your humidifier regularly to avoid a build-up of bacteria or mold growth. The tank and tube should be cleaned and rinsed well (1).

Finding the Best Filterless Humidifier

There are many advantages to opting for a filterless humidifier. Still, you should choose wisely. Here are a few points to consider when finding the best filterless humidifier:

Tank Capacity

Tank size plays an important role no matter what type of humidifier you’re buying. The tank capacity will determine how long the humidifier can work before needing to be refilled.

Large and small tanks each have their pros and cons, so you must consider your needs. For people who need the humidifier to run for long hours at a time, a large capacity is required. However, if you only need it to run for a few hours at the office, a small tank is sufficient.

Maximum Mist Output

The maximum mist output refers to how many ounces of mist the humidifier is able to produce per hour. This number can give you a very clear idea of just how effective the humidifier is going to be.

Many brands will give you a minimum and a maximum; these refer to the settings as well. So if you want the maximum output, the humidifier has to be at the highest setting.


Cleanliness plays an essential role in maintaining your filterless humidifier. Because there’s no filter, bacteria and germs can build up within the tank and tube. Most humidifiers will come with cleaning instructions.

However, this can cause another issue: tank access. Opening the tank and cleaning it is often easier said than done. Some humidifiers have a wide opening of 4 inches while others are barely 3 inches. This can make it tricky to get your hand inside with a sponge to clean it.

Don’t Forget The Tube

The tube is another tricky part that has to be cleaned. Some humidifiers have a self-cleaning feature that removes excess moisture from the tube. Otherwise, you’ll need a long, thin brush to give it a thorough clean.

The Best Filterless Humidifiers of 2022

As we searched for the humidifiers on our list, the above points were well-considered to ensure user-friendliness. We especially considered product specifications and genuine customer reviews. Here are the best filterless humidifiers.

1. Levoit Cool Mist Humidifier

Best Filterless Humidifier

One filterless humidifier loved by many is the Levoit Cool Mist. It works like a dream, bringing up the humidity quickly and quietly. It uses ultrasonic technology to create a cool mist that won’t cause dampness in your home.

Moreover, you can use essential oils to add instant freshness while still maintaining the required humidity for the area. The humidifier has voice control features by using the app from the manufacturer and synching it third party assistants such as Amazon or Google Assistant.

The Pros


The water tank of this humidifier can hold an impressive 1.59 gallon of water. Thanks to the size of the tank, the humidifier is able to run for up to 60 hours straight on a low setting. Consequently, you save time and effort of having to refill it multiple times. It can even run through the night to ease snoring and dry mouth.

Excellent Coverage

In order for the humidifier to cover your entire room or area, the nozzle can rotate 360 degrees to reach all corners. In addition, the cool mist will reach up to a maximum of 47 square meters. You can also set your preferred schedule of usage by using the app.

Thanks to ultrasonic technology, the mist is not only cool, but it’s also very fine and even. This, of course, makes it more comfortable for you.

Less Than 30 Decibel

Although the tank is large, it has an impressive ultra-quiet technology emitting less than 30 decibels of noise which is a perfect addition to your child’s nursery.

In addition, automatic mode will monitor the room humidity and adjust the mist output based on the target humidity you want to attain.

The Cons

Tendency to Produce White Film

One visible downside about using this large humidifier is its tendency to leave white film especially when you have a dark countertop or furniture although it doesn’t really leave a stain at all. You just need to wipe it down and notice as if nothing was even there.

Additional Specs

Working Hours Up to 60 hours
Tank Capacity 1.59 gallons
Max Mist Output Not specified
Dimensions 9.6 by 7.5 by 13.4 inches
Room Coverage 215 to 505 square feet

2. Dreamegg Quiet Cool Mist Humidifier

Quietest Filterless Humidifier

If you’re on the hunt for a small and compact humidifier, this is your guy. This humidifier might be tiny, but it’s certainly powerful. It produces a strong cool mist at a very quiet level. We love that it’s equipped with a silencer to help minimize any potential noise.

Customers and experts alike praise how easy it is to clean and keep clean, thanks to the unique arched design. In addition to being easy to clean, it’s also long-lasting and can produce mist for up to 30 hours.

The Pros


This humidifier works at a nearly silent level of fewer than 30 decibels. It’s excellent to keep in the bedroom during the night or in the nursery for your baby to sleep comfortably. It also features an optional dimmed night light that could be convenient in a child’s room.

You Might Also Like
Man reading in the living room with a humidifierKnow Exactly Where to Put Your Humidifier (Five Scenarios Explained)

The timer function comes in handy in more than one way. It allows you to set your desired run time at one, three or six hours. You can also set the humidifier to turn off automatically while you’re out or sleeping, to save time and energy.

Long-Lasting Humidification

Equipped with a 0.5-gallon tank, this humidifier can last between 15 and 30 hours at a time. If needed, it can run through the night as you sleep. Keep in mind, though, that it won’t last 30 hours on high.

Easy to Clean

Cleanliness is important when it comes to filterless humidifiers since dirt, dust, bacteria and even mold can build up.

Luckily, this humidifier is a breeze to keep clean thanks to its ergonomic smartly designed tank shape that easily fits a hand through. In addition, the shape makes it easier to grab as well so that you can empty or refill without trouble.

The Cons

Smaller Than Expected

This humidifier is small — it might surprise you just how small it actually is. Some customers were disappointed with the size since it does need to be refilled every day.

Additional Specs

Working Hours 12 to 30 hours
Tank Capacity 0.5 gallons
Max Mist Output Not specified
Dimensions 7 by 6 by 10 inches
Room Coverage Not specified

3. Geniani 4L Ultrasonic Cool Mist Humidifier

Best Large-Capacity Filterless Humidifier

If you need a humidifier for a larger room, this more than a gallon unit is for you.

The large tank can provide you with up to 18 hours of continuous use. Plus, you get to choose your preferred mist-per-hour. As a bonus, it features a calming night light, which makes it an excellent addition to a nursery or kid’s room.

Maintenance is a breeze as the wide opening of the tank gives you easy access with a sponge.

The Pros

Extra Large Capacity

This humidifier can hold a little under 2 gallons of water in the tank. As a result, it can work continuously for up to 18 hours with four mist outputs to choose from.

Easy to Clean

Being able to clean your filterless humidifier is crucial because there’s no filter to capture impurities. Luckily, this Geniani humidifier is super easy to clean thanks to its top-fill design.

This will help to prevent mold or mildew from forming within the tube.

Oil Diffuser Feature

Another feature that had enticed me to this product is the ability to add essential oils where most humidifiers are not capable of accommodating.

The Cons

Not for Tap Water

Because of being filterless, the need to use distilled water for filling in the humidifier is a must, at least for this product, as faucet water may trigger the build-up of mineral deposits.

Additional Specs

Working Hours Up to 18 hours
Tank Capacity 1.5 gallons
Max Mist Output 7.47 ounces per hour
Dimensions 9.06 by 6.69 by 12.2 inches
Room Coverage Up to 220 square feet

4. Everlasting Comfort Humidifier with Essential Oil Tray

Best Filterless Humidifier Diffuser Combo

If you’d like a humidifier that can do more than simply add moisture to your air, check this out. The Everlasting Comfort humidifier is a two-in-one humidifier and diffuser, with an essential oil tray. You can add a few drops of your favorite essential oils to create an aromatic atmosphere in your home.

In addition to the essential oil tray, the tank itself is impressively large, holding 1.6 gallons. It can last you up to 50 hours straight when on a low mist setting. We love the color options available — you can choose between white and mysterious black.

The Pros

Large Capacity

This humidifier will bring you endless hours of moist air to enjoy, thanks to the 1.6-gallon tank. It puts out a strong stream of mist and can cover areas of up to 500 square feet — perfect for a living room or large bedroom. Additionally, the large tank enables the humidifier to work for up to 50 hours straight.


We all love a fresh-smelling home, but we like to avoid air freshening sprays. With this humidifier, however, you can enjoy the natural scents of your favorite essential oils.

Simply add a few drops to the tray and the humidifier will circulate the oil through the mist, spreading it throughout your home.


As the humidifier begins to run out of water, the unit will automatically turn off to avoid dry burn. This is very helpful, especially if the humidifier were to run out of water during the night when you probably won’t notice.

The Cons

Difficult to Clean

The opening to the tank is rather small, so it’s tricky to get your hand inside to give it a thorough clean. You may need to fill it with some warm soapy water and use a long brush or sponge to clean thoroughly.

Additional Specs

Working Hours Up to 50 hours
Tank Capacity 1.6 gallons
Max Mist Output 9.5 ounces per hour
Dimensions Not specified
Room Coverage Up to 500 square feet

5. Vicks Filter-Free Ultrasonic Cool Mist Humidifier

Best Compact Filterless Humidifier

This tiny humidifier is super user-friendly with its compact design and dial knob controller. It can hold up to 1.2 gallons of water in the tank and can run for up to 33 hours on a low setting.

Furthermore, this humidifier is an excellent sleep companion thanks to the quiet operation and no bright LED lights.

Cleaning the tank can be easy since the opening is wide enough for your hands to fit.

The Pros


The size of this humidifier makes it an excellent choice for medium-sized rooms with compromised space. It can easily fit on any bedside table or shelf. It’s also a good option for an office where dry air might be bothering you.

Large Capacity

Despite the compact size, this humidifier is equipped with a 1.2-gallon tank. Although this may not be as impressive as others on our list, it’s still excellent for this size. Depending on the mist setting, it can last anywhere from 30 hours to 33 hours of continuous use.


If you like a dark and quiet night’s sleep, this little device is for you. It works ultra-quietly. Furthermore, there are no annoying bright LED lights that will disturb you while you’re getting some much-needed beauty rest.

The Cons

Vapo Pads Not Included

Unfortunately, it does not include a soothing menthol pads which you can purchase separately.

Additional Specs

Working Hours 30 to 33 hours
Tank Capacity 1.2 gallons
Max Mist Output Not specified
Dimensions 10.87 by 9.45 by 13.46 inches
Room Coverage 100-400 square feet

Filterless Humidifier Comparison Chart

Product Best Running Time Tank Capacity Max Mist Output Dimensions Room Coverage
Levoit Cool Mist Humidifier Overall Pick Up to 60 hours 1.59 gal. N/A 9.6 x 7.5 x 13.4″ 215—505 sq ft
Dreamegg Cool Mist Humidifier Quiet 12 to 30 hours 0.5 gal. Not specified 7 x 6 x 10″ Not specified
Geniani 4L Cool Mist Humidifier Large-Capacity 18 hours 1.05 gal. 7.47 oz p/h 9.06 x 6.69 x 12.2″ 220 sq ft
Everlasting Comfort Humidifier Humidifier Diffuser Combo 50 hours 1.6 gal. 9.5 oz p/h Not specified 500 sq ft
Vicks Cool Mist Humidifier Compact 30 to 33 hours 1.2 gal. Not specified 10.87 x 9.45 x 13.46″ 100-400 sq ft

Going Filter-Free

The best filterless humidifiers are becoming more and more popular due to low maintenance costs and quieter operation. These devices work effectively at bringing your humidity up to create a more comfortable home environment.

Before settling on a unit, consider its efficiency and how it will suit your lifestyle. You should also consider how easy it is to clean so as to save yourself time and effort.

Headshot of Matthew Sullivan

About the Author

Matthew Sullivan

Matthew is a freelance writer with several years of experience in DIY and HVAC. For as long as he can remember, Matthew has always found great pleasure in taking things apart and learning how to put them back together.