10 Best Filterless Humidifiers of 2023 – Healthy & Cost Efficient


When it comes to boosting the humidity levels of a home, humidifiers can never be underestimated. You also probably know how the conventional humidifiers work – the basic system comes with a filter. For your room to be supplied with fresh moist air, this filter must soak in water and its moisture blown by the fan into the atmosphere of the room.

However, the problem with this type of humidifier lies in its filters. First, you will need to keep changing the filters, a cumbersome and costly process. Second, dirty filters can fill your room with contaminants and disease agents if not regularly cleaned.

That is why we have researched the best filterless humidifier options on the market for you:

10 Best Filterless Humidifiers Reviews

In a hurry? Choose your best one from this quick buying decision list:

1. Vicks Filter-Free 1.2-Gallon Cool Mist Humidifier

Vicks Filter-Free Ultrasonic Cool Mist Humidifier, Medium Room,...
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Key Features:

  • Scent pad door for Vicks VapoPads.
  • Cool mist.
  • 2-gallon translucent tank.
  • Wide tank opening.
  • Up to 30 hours of operation.
  • For medium-sized rooms/covers 100-400 square feet.
  • Auto shut-off feature.
  • 1-year warranty.

The Vicks Filter-Free Cool Mist Humidifier comes with a 1.2-gallon tank capable of supplying cool mist for 30 hours to ensure that your comfort is intact. The tank is also see-through, allowing you to monitor the water level and observe any mold growth in it. With Vicks Filter Free, you are not just stuffing moisture into the house, you can make use of the scent pad slot on this device to place 2 Vicks VapoPads for a scented atmosphere.

If the water in the tank goes down below the minimum level, this appliance turns itself off due to the auto-shut feature. It operates quietly, hence it’s arguably one of the best humidifiers for the bedroom that doesn’t cause disturbance as you sleep while relieving the discomforts of dry air.

Vicks Filter-Free is a cool mist humidifier which offers hassle-free cleaning and comes with higher moisture output which enriches your air even more. You can’t go wrong with the wide tank opening on this humidifier; this feature enhances easy filling and cleaning of your tank.

  • Quiet operation.
  • Up to 30 hours run-in.
  • Comes with a stylish design.
  • Easy to clean.
  • Auto shut-off function.
  • Some mold build-up issues.
  • 1-year warranty.


Vicks Filter-free Cool Mist Humidifier is one of the must-have humidifiers you want in your bedroom. The fact that it is quiet and affordable makes it fit the bill.


2. Pure Enrichment MistAire Ultrasonic Cool Mist Humidifier

Pure Enrichment® MistAire™ Ultrasonic Cool Mist Humidifier -...
  • INSTANT DRY AIR RELIEF: Ultrasonic cool mist technology safely and quickly...
  • YEAR-ROUND COMFORT: High and low-speed settings combined with a 360° mist...
  • ENCOURAGE RESTFUL SLEEP: Easily run the humidifier overnight to maintain a...


Key Features:

  • 5 L water tank capacity.
  • Cool mist type.
  • 360-degree mist nozzle.
  • Whisper-quiet operation.
  • Auto shut-off function.
  • It can run for up to 16 hours.
  • Ultrasonic cool mist technology.
  • 2-year warranty.

This Pure Enrichment MistAire humidifier offers a 1.5-liter tank capacity which would adequately serve medium-sized rooms like bedrooms, offices, etc. with ease. Its 360-degree mist nozzle directs the moisture in outputs of 150 mm per hour and only at areas where it is needed for a run-in time of 16 hours without any interruption.

The unit is described as “whisper-quiet†because it emits almost no sound, of course at less than 30 dB you rarely get to hear any noise. This is important for your peaceful sleep and better even for your child. The auto shut-off feature comes in handy when the tank’s water level runs low.

With a transparent tank, you can clearly see whether the humidifier is running dry and can take the next step to fill it. You could also make use of the night glow function to enhance your relaxation, you can turn it off in case you find it irritating.

  • It has a 1.5-liter water tank and a runtime of 16 hours.
  • Auto shut-off feature.
  • The water reservoir is difficult to clean.
  • Doesn’t do well with hard water.


Pure Enrichment MistAire Humidifier is best used in medium-sized rooms such as bedrooms and offices. The appliance has been highly rated and with over 10,000 sales made, this humidifier is a go-to product for anyone looking to enrich the air in his or her room.


3. Honeywell HUL535B Cool Mist Humidifier

Honeywell HUL535B Filter-Free Cool Mist Humidifier, Black –...
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Key Features:

  • 1-gallon tank capacity.
  • Cool mist type.
  • 24 hours runtime.
  • Ultra-quiet operation.
  • Auto shut-off mechanism.
  • Directional mist outlet.
  • Large water tank opening.
  • 2-year limited warranty.

The Honeywell HUL535 Cool Mist model is an excellent option with variable output settings that offer you absolute control over the humidity levels in your house. First off, the 1-gallon tank capacity combined with the direction mist outlet work together efficiently to discharge cool mist into the room. This operation runs for 24 hours without hiccups, and in case the reservoir runs out, the auto shut-off mechanism shuts down the unit.

There shouldn’t be worries regarding the filling of the tank. With a large tank opening on the device, filling and cleaning are made easy. The compact design of this model is an ideal fit for regular nightstands without any major problem. Therefore, whether you are planning to place this humidifier in your bedroom or children’s room, go ahead – it fits, ideally, in medium-sized spaces.

  • Comes with variable mist settings.
  • Ultra-quiet operation improves both sleep and the atmosphere of the room.
  • Auto shut-off mechanism when the tank runs low.
  • A 2-year limited warranty.
  • Residual build-up.


Honeywell HUL535B has variable output settings that make controlling the cool mist coming out of it stress-free. If you have been thinking about which model is safe to place in the children’s room, then the Honeywell HULS535B is a humidifier you want to try.


4. GX·Diffuser Ultrasonic Cool Mist Air Humidifier

No products found.


Key Features:

  • 9-gallon tank capacity.
  • Ultrasonic humidification technology.
  • 20-36 hours operation.
  • Deep groove design.
  • Variable night lights.
  • Noise level <30db.
  • Auto shut-off feature.
  • Superior customer service.
  • 1-year warranty.

You can effectively cleanse your home atmosphere with this GXDiffuser Ultrasonic humidifier, it applies a 0.9-gallon tank that carries about 3.5 liters of water, and even at this relatively small capacity, the humidifier continuously runs for between 20-36 hours radiating cool mist. Adjust to the right settings to determine the exact time you want it to take to moisturize your space.

Many people have complained about their devices leaking water on their precious furniture – this is because they are poorly designed at the bases. This is not the case with GXDiffuser Ultrasonic – it features a deep groove base design that prevents leakage. Besides, it also offers protection such that when the device crashes on the ground, it’s resistant enough to withstand the pressure.

What’s more than a humidifier that glows at night to fool you into sleep? Well, the unit has the night light functionality which this offers different colors, you’ll definitely get your favorite. The auto shut-off feature ensures that it doesn’t run on an empty tank.

  • Excellent customer service.
  • No leakages due to the groove design.
  • Powerful and efficient.
  • Very easy to refill and clean.
  • The glowing lights can be very bright and irritating.
  • Not very ideal for large places.


This a good filterless humidifier that comes with its own unique feature that others don’t have – the grooved base. It is worth considering given that you want to be sure that your furniture is 100% safe from leakages.


5. Ultrasonic Cool Mist Humidifier by Geniani


Key Features:

  • Cool mist type.
  • 3-liter water tank capacity.
  • Automatic shut-off.
  • Mist nozzle.
  • Runs for up to 24 hours.
  • 2-year warranty.
  • Night lights.

For a fresh and pleasant atmosphere, this Geniani Ultrasonic Mist Humidifier utilizes a 3-liter tank and 360-degree mist nozzle to introduce clean moisture into your space. The latter also ensures that only the target areas are humidified. This operation, just with a single refill, can take up to 24 hours. Once the water runs out of the tank, the device shuts down automatically to stop potential damages like overheating.

This humidifier rolls three aspects into one; it is a purifier, oil diffuser, and produces night light, making it a very dynamic appliance for use in different ways. It’s built with antibacterial technology material that effectively protects the device and suppresses any growth of molds inside the container.

Using the settings dial, you can easily adjust the cool mist level to fit your needs. The silent operation of this model gives you all the time to enjoy sleep or low-tone conversations. And with 2 years tagged on its warranty, you can be pretty confident that this product is of great quality.

  • Easy to use.
  • BPA-free.
  • The night light can be turned off.
  • Easy to clean and fill.
  • Maybe large for small rooms.
  • Cleaning instructions aren’t very crystal clear.


This device is not only good for living spaces and bedrooms, but it’s also highly recommended for air enhancement in nurseries.


6. Opolar Quietest Filter-Free Digital Humidifier

No products found.


Key Features:

  • 8/3-L tank capacity.
  • Built-in timer.
  • 12-26 hours of continuous running.
  • 3 mist adjustment levels.
  • Auto shut-off feature.
  • 1-year warranty.

For an all-around performance and efficient output, you cannot go wrong with the Opolar Quietest Filter-Free Digital Humidifier. The excellent functionalities of this humidifier start with the 0.8-gallon tank capacity, a sizeable volume to ensure water supply for moisture release is available for up to 26 hours. Talking about moisture discharge, there is a twin nozzle that releases the mist in the direction you want.

There is no better device than the one that makes less than 35db of sound. That is Opolar humidifier for you, the quietest among many. It also features a built-in timer which gives you maximum control over the amount of humidity you want in the space. The three mist adjustment levels are the perfect complement to the timer to ensure that you get your comfortable humidity.

The auto shut-off mechanism enables the Opolar Digital humidifier to stop running when the volume of water goes down beyond the minimum. The night mode feature is well created to ensure that not a lot of brightness is dispersed while you sleep. You will definitely enjoy the LED display (which is always a fun feature) while dialing for different settings.

  • Built-in timer for humidity control.
  • Quietest model.
  • Comes with 3 different mist settings.
  • Easy to operate.
  • Beeping after the water runs out.
  • Not easy to see through the dark material tank.


This device is rated highly among consumers who have already bought and used it. And it puts in a strong overall performance; whether you want to use it in the bedroom, office, or children’s room and perhaps even larger spaces, it’s output is huge.

7. Everlasting Comfort Ultrasonic Cool Mist Humidifier

Everlasting Comfort Ultrasonic Cool Mist Humidifier for Bedroom...
  • 💨Long Lasting Coverage for Your Home, Office, Nursery, or Dorm: Our...
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  • 🔇Safe to Use, Whisper Quiet: Our large room humidifier is nearly silent...


Key Features:

  • Cool mist type.
  • 6-liter water tank capacity.
  • Mist time up to 50 hours.
  • Covers up to 400 sq. ft.
  • Auto shut off.
  • Night light mode.
  • 2-year limited warranty.

If you are in search of a more serious device in terms of area coverage, then try Everlasting Comfort Ultrasonic Cool Mist Humidifier – it covers a total area up to 400 square feet. This is possible because of its large capacity (6 liters/1.6 gallons) tank that combines with the 360-degree nozzle to discharge mist at 270ml/hr.

Convert this to days and you will have a tank lasting up to 6 days using only a single refill. In terms of hours, the mist will disperse for up to 50 hours continuously.

It comes with a built-in essential oil tray to bring the benefits of aromatherapy close to you. The auto shut-off feature gives you a peace of mind and rest knowing that the device will just shut down after the water has been used up. This translates into a safety measure both for you and the device so that it lasts long.

  • Quiet operation.
  • Large capacity tank for extended runtime.
  • You can add essential oils to the mist.
  • Auto shut-off function.
  • Some spaces and parts are difficult to clean.
  • Reported instances of leakages at the base of the device.


This device is highly recommended for people who want to mist large spaces on minimal costs. Everlasting Comfort is one of the best cool mist humidifiers that gives you the value you need at low costs.


8. Crane Humidifier, Ultrasonic Cool Mist Humidifiers

Crane Drop Ultrasonic Cool Mist Humidifier, Filter Free, 1...
  • VARIABLE SPEED SETTINGS: No matter the humidity level you would like to...
  • WHISPER QUIET: Crane's Adorables humidifiers runs whisper quiet which makes...
  • ONE GALLON TANK: The 1 gallon tank fits under a standard kitchen or...


Key Features:

  • Cool mist type.
  • 1-gallon tank capacity.
  • 24-hour runtime.
  • Whisper-quiet.
  • Covers up to 500 square feet.
  • 45 watts power rated.
  • 1-year limited warranty.

This ultrasonic cool mist comes with a powerful, efficient work rate for top-rated performance. Its efficiency begins right with the 1-gallon tank capacity that is capable to run for up to 24 hours before it clears up – that is a full day with just one refill. And this happens quietly giving everyone in the room a peaceful time to rest, sleep or do other things that require silence.

Crane humidifier is designed to cover a huge 500 feet square area; this is the average area of most apartments. This might deceive you to think that the device would need and utilize a lot of electricity – but apparently, the regular light bulb consumes even more than this device. The base is made from anti-microbial material, you may as well never think about bacterial and mold growth, leave alone seeing them – this material resists this growth up to 99.96 percent.

The auto shut-off function is another addition to this elegant device, it activates to stop the machine from running when the water gets used up to a certain level. Take note that this device is compact and BPA free, an assurance of its safety.

  • Quiet, efficient operation.
  • Energy efficient.
  • Simple to use.
  • Warranty information not very clear.
  • Not quite easy to fill the tank.


The Crane Humidifier is an efficient and economical device that would be useful when embarking on your single-room humidification project.


9. Ucareair Cool Mist Humidifier

UCAREAIR Humidifiers for Bedroom Humidifiers Auto-Shut Off Cool...
  • 【AUTOMATIC SHUT-OFF for INCREASED SAFETY】Cool Mist Humidifiers will...
  • 【ALL NIGHT MIST with 2-LITER WATER TANK】Cool Mist Humidifiers for...


Key Features:

  • 5-gallon tank capacity.
  • Super-quiet, <32db.
  • 10 hours of operation.
  • Covers 200 square feet.
  • Auto shut-off.
  • 360 –degree mist nozzle.
  • 2 mist level settings.
  • 1-year limited warranty.

Here comes Ucareair Cool Mist Humidifier with a 0.5-gallon tank that can provide for an area of up to 200 square feet. So, for small rooms like offices, babyrooms, and bedrooms, this device is going to be the perfect cool mist provider. It is very quiet at 32 db noise level, providing ultimate peace and comfort for those studying, conversing at low tones, and light sleepers.

The tank is able to run for 10 hours uninterrupted while you enjoy the cool mist all over the room. The tank doesn’t just hold water, it’s arc-shape design is ergonomic, offering a secure grip so you can carry the device comfortably whether for refill or placement. The auto shut-off feature compensates for the super quiet of this humidifier; it shuts down the system, even if all the water may have been used up.

What is handy for fun lovers and babies if you want them to breeze easy into sleep? The night light functionality of this device makes it glow in the dark, and because it’s dim, you will be completely blown away in sleep. Just press the high/low mist button to either increase or decrease the speed of mist dispersion and specify the direction you want it.

  • Super quiet.
  • Auto shut-off for safety.
  • The tank is easy to carry and refill.
  • Great customer service.
  • Only suitable for small living spaces.
  • 1-year warranty.


For light sleepers, this humidifier is going to be a real game changer. It lets you even forget to turn it off (because it’s too quiet) until it automatically shuts down when the tank is waterless.


10. PureGuardian H940 Ultrasonic Cool Mist Humidifier

Guardian Technologies Pure Guardian H940 Ultrasonic Cool Mist...
  • COOL MIST HUMIDIFIER: The PureGuardian H940 Ultrasonic Cool Mist Humidifier...
  • ULTRASONIC TECHNOLOGY: The H940 disperses a soothing, cool mist into the...
  • GREAT FOR SMALL ROOMS: The .5 gallon tank provides up to 30 hours of run...


Key Features:

  • 5-gallon tank capacity.
  • 30 hours runtime.
  • Ultrasonic technology.
  • High and low cool mist settings.
  • 120 volts power input.
  • Compact design.
  • Silver Clean Protection.

With a small 0.5-gallon tank reservoir, PureGuardian Ultrasonic Humidifier is another small humidifier model you can try out. It is very small but supplies cool mist for up to 30 hours continuously before you refill. This compact design makes it a great addition to your small-sized spaces, and unlike the larger capacity tanks, refilling this one isn’t a hassle.

The tank has been applied with Silver Clean Protection on its bottom side to control the problem of mold growth, a step to ensure that the mist supplied is harmless. One huge addition to this model is the ultrasonic technology which doesn’t just help to distribute a fine mist into the air but also makes the device ultra quiet.

This is what makes this humidifier unit a pride for anyone who likes to rest, sleep, work, or study in silence. You will be notified by a refill indicator light to add more water to the tank. If you miss the notification, the auto shut-off feature turns off the unit for safety.

An optional night light, 3-speed settings for mist release, and the directional mist nozzle make this device more efficient and productive at its job. What’s more, it attracts many positive reviews on Amazon because of the abundance of these smart features.

  • Quiet dispersion.
  • Space-saving design.
  • Easy to use.
  • Its tall size can limit refilling under certain taps.


This is the type of humidifier you want to have in case you are worried about molds and bacterial accumulation. The Silver Clean Protection under the tank is featured to clear this problem so you can enjoy without having to worry about contaminants.


Buying Guide for Filterless Humidifiers

While we have researched and compiled what you see above, you have another task, you have to choose EXACTLY what suits your needs. Before you buy the right or best filterless humidifier for winter, your bedroom, or other setups, ensure you check on the following features.

Mist Type

Fortunately, in this guide we talked about cool mist filterless humidifiers, however, we didn’t discuss warm mist filterless humidifiers – which basically pre-heats water to kill bacteria before diffusing it (the mist) into the atmosphere. So, depending on your needs, select what is suitable for you.

Water Tank Capacity

This is very vital as it determines the effectiveness and the success of the humidification process of your home or room. This factor, along with the size of the room you are looking to moisturize, dictates the number of hours the humidifier will take to cleanse your space.

That being said, a large capacity tank means more hours of operation and better results in a big room. The same goes for a smaller tank, which is the best for small and medium-sized rooms.

Area of Coverage

Consider checking what area the unit you’re buying can cover, 160 sq.ft., 200 sq.ft., 400 sq.ft., 500 sq.ft., and so on. Some only cover small areas while some are designed to cover large areas. You will definitely need to match the device to the respective area before making a move. Don’t overbuy!

Look for a Humidistat

Ensure that the unit you are purchasing has a humidistat – or a setting that controls the level of humidity so it remains within the correct range – so it doesn’t go either side of both extremes.

Noise Level

You also want to find out how many decibels of sound the model emits, they all make a sound, but some models are outrageously noisy. There are quiet humidifiers on the market, just keep in mind that quiet humidifiers ensure a peaceful sleep.

Extra Features

High-end humidifier models come with a variety of features. Normally, these are the most efficient in moisturizing a room, but the attached price-tags may be a hamper, although many humidifiers are generally not very expensive.


This is very important – it represents the quality of the device you want. Ensure the warranty information is clear and understandable. Some brands can be sneaky on this matter, so it’s good to be vigilant.


FAQs about Filterless Humidifiers

What is the technology behind filterless humidifiers?

Well, first, these humidifiers do not have and do not use filters like the traditional ones you know. Instead, they utilize a combination of methods to purify water before releasing the mist.

For example, some incorporate antibacterial materials, while others use electrostatic charge technology, and for other types such as the warm mist models, you will hear of the pre-heating mechanism that purifies water first.

Can I set my unit for the whole night, should I have any safety concerns?

This depends on the time of the year, but generally, it is never going to be such dry to require your device to keep going deep in the night – it’s usually humid. Your safety will be always secured because these units are user-friendly.

They are designed to be used in bedrooms (of course other spaces too), the key is they are human-oriented. They improve sleep, contribute to softer skin, and can even speed up your healing process if you are sick.

Can I use tap water in my filterless humidifier?

Yes, although tap water contains more contaminants and minerals. With continuous use, these can form solid deposits in your humidifier, reducing its efficiency. This will put you to the task of regularly cleaning your device (not bad anyway, ha!). But seriously, it’s good to use distilled water all the time – as recommended by experts.

How often should I change the water in the humidifier?

Well, make sure you change the water before each use, and if there is still some water in the reservoir, you may opt to empty and change or leave it to be completely used, then refill with clean water. Just make sure that with every single refill you wash the tank and add new clean water to it.


Final Thoughts

Now that you have an understanding of filterless humidifiers, and you are also aware of a few great models, it’s time to mist your room. Don’t mess up things, just be calm and choose the cool device you want to see in your room. Whether it is the Vicks Filter-Free Cool Mist Humidifier or the Pure enrichment MistAire, figure out which model fits your bill.

Having said that, we find the Pure Enrichment MistAire quite interesting and, therefore, take it as our best pick on the market. It is powerful and consistently performs well. MistAire is also highly rated by many consumers online.

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