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5 Best Ultrasonic Humidifiers of 2024

Here’s why you should go the ultrasonic route.

If you spend a lot of time at home, you may notice your skin feeling dry. The air in your house typically lacks moisture, which is why your skin will be more prone to drying out indoors (1). You may even find your eyes and nose become irritated too.

If this is the case, then you may need a humidifier. In this article, we’ll be talking about the five best ultrasonic humidifiers available right now. So, wave goodbye to dry skin caused by the air in your home.

To conclude our list, we spent hours researching real customer reviews and expert advice. We investigated each product’s humidifying ability, capacity, use type, and additional features. We’re confident in our top choices and their power to transform your home air.

Our Top Picks

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Product Comparison Table

Product Image of the Levoit LV600HH Hybrid Ultrasonic
Best Overall Ultrasonic Humidifier
Levoit LV600HH Hybrid Ultrasonic
  • High mist output
  • Warm & cool mist settings
  • Long runtime
Product Image of the Geniani Top Fill Cool Mist
Best Small Ultrasonic Humidifier
Geniani Top Fill Cool Mist
  • Smart mode
  • Easy-access control
  • Easy refill
Product Image of the PureGuardian H4810AR Cool Mist
Best Large Ultrasonic Humidifier
PureGuardian H4810AR Cool Mist
  • Silver clean tank
  • Long runtime
  • Aromatherapy tray
Product Image of the Winix Cool Mist
Best Budget Pick
Winix Cool Mist
  • Night light feature
  • Silent operation
  • 1-year warranty
Product Image of the Pure Enrichment MistAire
Best Portable Option
Pure Enrichment MistAire
  • Whisper-quiet technology
  • Five year warranty
  • Optional night light

Review Methodology: At Oh So Spotless, our extensive analysis and hands-on experience with ultrasonic humidifiers enable us to provide you with a trustworthy assessment of the best products available. Our experts meticulously research, compare, and evaluate products based on criteria such as performance, design, and user experience. We gather data, rank products, and share quantitative measurements to help you make informed decisions. Our reviews address key factors such as mist output, noise levels, capacity, energy efficiency, and ease of use. By examining the design choices and their effects on users, we identify what sets the top ultrasonic humidifiers apart from their competitors and provide first-hand evidence to support our recommendations. Trust us to guide you through the process of selecting the perfect humidifier for your needs.

The Best Ultrasonic Humidifier of 2024

You’ll find that there are many ultrasonic humidifiers online or in stores. If you’re struggling to narrow down your search, we’ve collected five of the best ultrasonic humidifiers. We concluded this comprehensive list based on expert advice and what real customers had to say.

Keep reading to meet humidifiers that can transform the air in your home thanks to their fantastic output, room coverage, and unique features.

Levoit LV600HH Hybrid Ultrasonic Humidifier

Best Overall Ultrasonic Humdifier

This first entry on our list should suit the majority of users. The Levoit LV600HH is a germ-free and whisper-quiet ultrasonic humidifier that offers warm and cool mist settings.

The great thing about this humidifier is its convenience. It has a low noise level, a timer to switch itself off, remote control, and a built-in sensor to detect humidity levels. The benefit of all these features is that you won’t have to spend too much time fiddling with them.

Those of you with larger homes will also want to consider this model. It can cover over 700 square feet. The design is sleek and modern, which should fit with the majority of the decor.

What We Like

High Mist Output

This is a particularly attractive option if you’re looking to cover a larger space. This humidifier provides a mist output of 500 milliliters an hour, meaning it can easily cover 753 square feet.

Warm and Cool Mist Settings

You will want different temperatures of mist depending on the time of year. This setting means you can get warm mist in the winter and cold mist in the summer. It’s way easier than having to buy more than one humidifier.

50 Hours of Use

Another significant advantage of this humidifier is that it can run an impressive 50 hours on the low mist setting.

Fast Humidity Results

This super-efficient humidifier works four times faster than its competitors. In fact, it can raise humidity levels by 10 percent in just 20 minutes, providing instant relief.

Less Than 28 Decibels

Do you want something quiet? Then this is a fantastic option. Running at less than 28 decibels, this is one of the quietest humidifiers we have found.

To put it in context, 28 decibels is quieter than a whisper — more like leaves rustling.

What We Don't Like

Some Reports of Leakage

Customer feedback suggests this humidifier may have issues with leakage. We do want to stress that this doesn’t appear to be a frequent issue and may be related to defective units. You should contact the manufacturer if it happens to you.

Inconvenient Bottom Fill Design

When you have a bottom-fill design, it can be really frustrating, especially when everything else about the unit is so good. Refilling this bad boy is slightly annoying, but once you get the hang of it, hopefully, it doesn’t bother you so much.

Hygrometer Could Be More Accurate

One common complaint about humidifiers is their built-in humidistat. This one can give you inaccurate readings sometimes. This can cause you to prematurely switch off the machine when you think the humidity is at 55, but it’s maybe only around 45.

Product Specs

Dimensions 11.3 x 7 x 10.5 inches
Capacity 7.1 L / 1.58 Gallon Capacity
Refill Type Bottom Filled
Use Time 50 hours on Low Mist Level
Additional Essential Oil Diffuser

Our Ratings

4.5 / 5
Noise Level
4.5 / 5
Maintenance Requirements
3.5 / 5
Energy Efficiency
4 / 5
Total Rating
4 / 5

User Experience

My experience with this humidifier has been largely positive, though not without a few minor issues. I appreciate the dual hot and cool mist options, as well as the adjustable humidity levels. However, I highly recommend purchasing a separate hydrometer, as the one built into the unit is not entirely accurate. The humidifier performs decently in a smaller room, but may struggle with larger or high-ceilinged spaces. When it comes to cleaning, the process can be a bit cumbersome, especially for those with larger hands. Despite these drawbacks, I find that the humidifier effectively adds moisture to the air, helping to alleviate dryness and improve the overall air quality in my home.

Geniani Top Fill Cool Mist Humidifier

Best Small Ultrasonic Humidifier

Great things can come in little packages: say hello to the Geniani top-fill cool mist humidifier. With a 4-liter capacity that covers 220 square feet, it may not be the humidifier for a large office, but it won’t let you down.

This machine has one of the most convenient filling options we’ve seen. The water is poured into the top rather than the bottom, and you don’t need to remove the cap.

One of the benefits of this humidifier is that it offers a smart mode with an intelligent sensor that automatically adjusts moisturizing speed to match the environment.

This is the best option for you if you want a humidifier for a small room or space.

What We Like

Smart Mode Humidity Sensor

We really can’t overstate how cool this smart mode is. You don’t have to pay attention to how your environment is changing because the built-in sensor does it all for you. It really puts this one on another level.

Easy-Access Control Button

Having a control button is important anyway, but it’s even better when you have a button you can easily reach. It’s right on the front!

Easy to Refill the Tank

This is probably the easiest of the humidifiers to refill. It only takes a couple of minutes, and you don’t even have to remove the cap. Just pour the water straight into the top.

Good Looking Machine

If you’re a minimalist, you’ll love this sleek machine. It’s a simple white unit that will look good in any home or office.

Optional Oil Diffuser

If you love essential oils, you can use this as a diffuser. You add essential oils to a small tray, and it will distribute them as it runs. This is amazing if you like diffusing lavender at night or peppermint during the day.

What We Don't Like

White Dust Accumulates

We have seen some feedback that suggests this humidifier may generate more white dust than other options.

You Need Distilled Water

This adds a running cost to using the machine since you can’t use tap water. This leads to a build-up of mineral deposits in the machine.

Mold Issues Arise

This machine is quite hard to dry out. When you deep clean it, you must leave it for a while to air out completely. Otherwise, mold and mildew quickly become an issue.

Product Specs

Dimensions 9.06 x 6.69 x 12.2 Inches
Capacity 4 Liters
Refill Type Top Fill
Use Time 18 Hours on Low-Speed Mode
Additional Smart humidity mode and essential oil diffuser

Our Ratings

4 / 5
Noise Level
4 / 5
Maintenance Requirements
3 / 5
Energy Efficiency
4 / 5
Total Rating
3.75 / 5

Personal Perspective

Love this product for its sleek design and quiet operation, making it a great addition to my desktop. The light feature adds a nice touch to the overall mood, and it's perfect for supplementing the humidity in my dry environment. However, the button is a bit loud and the mist output could be more effective. Despite these minor drawbacks, the smart setting and automatic shut-off features are convenient, especially when I forget to turn it off or refill the water. I've used it daily for over half a year, and it has made a noticeable difference in my sleep quality. Just be prepared for the possibility of a shorter lifespan if you plan to use it as frequently as I did.

Pure Guardian H4810AR Cool Mist Humidifier

Best Large Ultrasonic Humidifier

The Pure Guardian H4810AR cool mist humidifier is probably the best of the large options. It has a two-gallon capacity and can cover 600 square feet.

This compact humidifier is quiet, filter-free, and offers a huge 120-hour run time. It’s not as convenient as other options in terms of functionality. However, it has everything you need without paying much extra money.

It also can generate both cool and warm mist, which is always a bonus in a humidifier.

What We Like

Silver Clean Tank

Humidifier tanks get dirty very easily, and you don’t want nasty gunk building up in yours. This model helps tackle the issue by providing silver clean protection, which helps prevent the build-up of mildew.

Long Continuous Use

This model has an impressive running time of 120 hours. This is thanks to the extravagant 2-gallon tank. That’s a great feature if you don’t want to be constantly checking up on your machine.

Included Aromatherapy Tray

If you want to add essential oils, this is the humidifier for you. Simply add a few drops to the aromatherapy tray and enjoy the soothing mist that distributes into the air around you.

What We Don't Like

Not the Easiest to Clean

Many of the humidifier’s parts can’t be removed or moved about, making deep cleaning a little tricky. It also develops scum and deposits quite quickly, so don’t forget to deep clean weekly.

It Might Leak

While this isn’t a super prevalent complaint among customers, it’s still worth noting. A few people have found that the tank leaks, especially in certain settings. So while high and low might be fine, the medium setting might sometimes cause leaks.

Product Specs

Dimensions 7.75 x 15.03 x 12.48 Inches
Capacity 2 Gallons
Refill Type Top Fill
Use Time Up to 120 Hours
Additional Silver Clean Tank and aromatherapy tray

Our Ratings

4 / 5
Noise Level
4 / 5
Maintenance Requirements
3 / 5
Energy Efficiency
4 / 5
Total Rating
3.75 / 5

Community Feedback

I'm thrilled with this product as it has made a noticeable impact on the comfort of my living space. The quiet operation allows for a peaceful night's sleep, and the two-gallon capacity lasts for a few nights before needing a refill. I appreciate the ease of use and the visible vapor output, which is both pretty and effective. To maintain optimal performance, I ensure my hands are clean when handling the device and use distilled water to prevent white dust accumulation.

Winix Ultrasonic Cool Mist Humidifier

Best Budget Pick

The Winix Cool Mist Humidifier will keep your room fresh for 30 hours, depending on the setting.

This humidifier is the perfect example of how something on the cheaper end doesn’t necessarily mean it lacks features or convenience.

In fact, this humidifier and its 0.06-gallon tank produce a phenomenal amount of mist, enough to make your room or office feel like a tropical jungle.

What We Like

Night Light Feature

If you’re someone who can’t sleep in pure darkness, this humidifier offers you a night light. That should also work if you plan to put the ultrasonic humidifier in your kid’s room. You can choose from colors blue, green, or amber as a nighttime glow.

Silent Operation

This model operates in near-silence. In general, background machine noise can be annoying, but this is especially advantageous when you’re sleeping or trying to relax.

1-Year Warranty

Warranties can be a real lifesaver. Even when you buy a fantastic product, there’s always the most minor of chances that you might get a defective unit.

User-Friendly Design

This unit is easy to use. You can set the mist output level by turning the dial on the front of the unit. It’s also super easy to refill, thanks to the top-fill design.

When the unit is low on water, it will automatically shut off. So if you’re out of the house or busy in the kitchen, you don’t have to worry about the device.

What We Don't Like

Slightly Fidgety When Full

There is a slight annoyance to this one: it’s hard to carry around when full. After you refill it, you have to hold it super steady. Otherwise, water will splash out of it, causing puddles along your floor. The lid also isn’t secure, so you have to be super careful when transporting it.

Leaks Can Happen

After a few months, a handful of customers noted that the unit started to leak from the bottom. Another issue is that some of the lower settings don’t push out enough mist, which causes water to settle around the unit.

Product Specs

Dimensions 6.9 x 7.1 x 9 inches
Capacity 2.27 L Capacity
Refill Type Top Refill
Use Time 30-Hour Continuous Use on Low Mist Setting
Additional Three nightlight colors

Our Ratings

3.5 / 5
Noise Level
4.5 / 5
Maintenance Requirements
3.5 / 5
Energy Efficiency
4 / 5
Total Rating
3.75 / 5

First-Hand Impression

I recently purchased this humidifier and have noticed a significant improvement in my skin and hair's dryness. The compact design is perfect for small spaces, and it's super easy to clean and fill. The only downside is the lack of an angled nozzle, but overall, this product is efficient, quiet, and a great value for the price.

Pure Enrichment MistAire Ultrasonic Cool Mist Humidifier

Best Portable Option

The Pure Enrichment large room humidifier is one of the best models out there in terms of continuous operation. It runs for 25 hours.

Weighing only 1.35 pounds, this is indeed a handy humidifier you can easily transfer from one room to another. Moreover, the mist output can be adjusted from high to low depending on the room’s humidity.

What we love about this MistAire humidifier is its nightlight option, wherein it transforms into a beautiful bedroom essential.

What We Like

Whisper-Quiet Technology

This machine is perfect for use in the nursery as it runs quietly and won’t cause a disturbance to your precious one.

Five Year Warranty

Here’s a big bonus point for you! It comes with a whopping 5-year warranty giving you the confidence that this will surely last you a lifetime.

Optional Night Light

In the realm of nifty features, this model has a really nice one — an optional night light. It gives your room a modern fancy touch with its soft blue hue. The entire humidifier turns off, so you won’t have to see it lit up in the dark.

Easy to Use and Refill

The uncomplicated design is a plus point for customers. It’s also super easy to refill the tank. Simply take it to the sink and fill it up. We also love the auto-shutoff, which kicks when the water level is low, or you’ve removed the tank.

360-Degree Mist Nozzle

If you want evenly distributed mist, then this is totally up your street. The 360-degree mist nozzle will balance the humidity across the home, which can help with flu and cold-like symptoms.

What We Don't Like

Some Reports of Leaking

Some buyers report issues with leaking. Contact the manufacturer if you find this issue with your humidifier.

Delivers Slow Results

If you want quick results — which is useful in particularly dry climates — you might be disappointed in this. It can take a long time for the humidity levels to rise to your desired percentage.

Avoid Tap Water

If you live in a hard water area, this unit will require distilled or purified water. Hard water can cause the unit to leave behind a residue in and around itself.

Product Specs

Dimensions 8 x 6 x 9 Inches
Capacity 1.7 L Capacity
Refill Type Top Fill
Use Time 25-Hour Continuous Use on Low Mist Setting
Additional Night light and 360-degree mist nozzle

Our Ratings

4 / 5
Noise Level
4.5 / 5
Maintenance Requirements
4 / 5
Energy Efficiency
4 / 5
Total Rating
4 / 5

User Experience

Great product with a few learning experiences along the way! I've had the MistAire Ultrasonic Cool Mist Humidifier for a while now, and it works wonders for both my room's atmosphere and my indoor greenhouse. Just remember to use distilled water instead of tap water to avoid mineral buildup and potential mold, and you'll have a fantastic humidifier that delivers great results!

Product Comparison Chart

Product Best Dimensions Capacity Refill Type Use Time Additional
Levoit LV600HH Hybrid Ultrasonic Overall Ultrasonic Humidifier 11.3 x 7 x 10.5″ 7.1 L Bottom Filled 50 hours Essential Oil Diffuser
Geniani Top Fill Cool Mist Small Ultrasonic Humidifier 9.06 x 6.69 x 12.2″ 4 L Top Fill 18 Hours Smart Humidity Mode and Essential Oil Diffuser
Pure Guardian H4810AR Cool Mist Large Ultrasonic Humidifier 7.75 x 15.03 x 12.48″ 7.57 L Top Fill 120 Hours Silver Clean Tank and Aromatherapy Tray
Winix Ultrasonic Humidifier Budget Pick 6.9 x 7.1 x 9″ 2.27 L Top Refill 30 Hours Three nightlight colors
Pure Enrichment MistAire Portable Option 8 x 6 x 9″ 1.7 L Top Fill 25 Hours Nightlight and 360-Degree Mist Nozzle

Types of Humidifiers

If you’re a novice to these gadgets, let’s first talk about the different types of humidifiers.


An evaporative humidifier produces moisture by sucking in air from the surrounding environment — via a fan — and moving that air over a wick. The wick is moist, and the water vapor is released back into the air.


Ultrasonic humidifiers contain built-in tanks or reservoirs, and water vapor is released through rapid vibration. The inaudible vibrations create this vapor by breaking down water particles.

Nowadays, ultrasonic humidifiers have become the most popular option. One of the main reasons for this is the quiet noise level. Ultrasonic humidifiers are easily the quietest of all humidifier types.

There is some controversy around ultrasonic humidifiers due to “white dust” (2). This forms because there are minerals in the tap water you are likely to use in your humidifier. We suggest reading up on this and being aware of the type of water you use in your machine.

How to Choose the Best Ultrasonic Humidifier

Every humidifier comes with a set of unique features. Consider these to pick the right one for your home:


It’s essential to get a humidifier with some form of humidistat. A humidistat controls the humidity level in a room.

This will allow the machine to detect the room’s humidity level and adjust itself accordingly. If it doesn’t have this, you risk the humidifier creating too much moisture in the air.

In this case, you may end up with a bad case of mold or mildew growing all over your walls and ceilings. These aren’t just gross; they’re also bad for your health and particularly dangerous to vulnerable groups like children (3).

However, you can buy a separate humidistat or hygrometer to keep near the humidifier. This will continuously check the humidity levels so you can switch off the humidifier if it goes above your desired level.

Low Noise

One of the reasons why ultrasonic humidifiers are so popular is that they produce so little noise. In fact, you can get models that are basically silent.

When browsing humidifiers, take a close look at the specs or product description, and it should let you know. The noise level is usually measured in decibels.

If you’re sensitive to noise, we recommend something below 33. Anything higher may be a soothing white noise vibe to you, but not everybody likes the background noise.

Variety of Settings

You may think that there is simply one “good air moisture level” and that there isn’t much adaptability between environments.

First, consider the different seasons. Humidity is vastly different between summer and winter. You might be in a region where the humidity is crazy high at certain times of the year.

Secondly, options such as “dry skin” and “cold and allergy” are essential. These all call for different moisture levels to keep you comfortable. Your house might be more prone to dryness than others, and your allergies are definitely a concern.

When shopping around, make sure the humidifier you’re looking at has a variety of pre-programmed settings. Otherwise, it may not be able to tackle your specific needs.

Area Coverage

All the rooms in your house are different sizes, as are people’s offices. Humidifiers are designed for rooms of all sizes — some can even cover up to 1,000 square feet! But, not every humidifier will be able to cover a large room.

If your room or space is small, you may want to consider a tabletop option.


Like a lot of machines, a humidifier needs to be cleaned. More unique to humidifiers is they need to be refilled — how often this will be, depends on the size.

Humidifiers need regular cleaning— at least a basic rinse and dry. This is important as the inside of the machine is warm and moist, which is the perfect environment for bacteria to grow. So, you need a machine that you can access easily to clean correctly.

These machines also come with different refill options, including bottom and top refills. A top refill is easier, as you don’t have to move the humidifier to do anything. This will depend on size, though, as not every humidifier can be a top refill.

What Makes an Ultrasonic Humidifier Different?

We’ve gone through the basics of how an ultrasonic humidifier works differently from an evaporative one; you may wonder if that affects anything.

Let’s take a look at the benefits an ultrasonic humidifier gives you.


Some evaporative humidifiers utilize heat to generate the necessary water vapor to release into the air. This inherently has a level of danger due to the potential of overheating. Ultrasonic humidifiers, however, do not require any heat at all.

More Control

Ultrasonic humidifiers are generally the more modern and more technological option. The mechanism allows for more features and controls to streamline the entire process. This includes features such as nightlights, automatic shutoff, automatic switching between settings, and switching between cool and warm mist.

Less Wastage

Overall, ultrasonic humidifiers consume less power. This means less wastage and more savings for you.

How Long Do Ultrasonic Humidifiers Last?

Ultrasonic humidifiers usually last around two to six years, depending on how well you maintain them. Lifespans vary for different brands and different sizes.

Make sure you clean your humidifier regularly to keep it running efficiently, and you’ll get your money’s worth.


Are Ultrasonic Humidifiers Good for Health?

Ultrasonic humidifiers are good for health because they humidify the air and prevent dry, itchy skin, blocked nasal passages, and sore eyes and throat.

Do Ultrasonic Humidifiers Hurt Dogs’ Ears?

Some ultrasonic humidifiers can hurt dogs’ ears because they emit a high-pitched sound as they operate. The best solution to the problem is to avoid the rooms where the dog sleeps.

Why Do Ultrasonic Humidifiers Stop Working?

Most ultrasonic humidifiers stop working because they are dirty and the diaphragm needs cleaning. The diaphragm stops vibrating and becomes clogged with grime and other debris.

Can You Use Tap Water In Ultrasonic Humidifiers?

No, you shouldn’t use tap water in ultrasonic humidifiers. Tap water contains impurities like minerals and heavy metals that contaminate indoor air. It also leaves a white residue on all your surfaces when the air dries.

Can I Use Essential Oils In an Ultrasonic Humidifier?

You can use essential oils with an ultrasonic humidifier, provided it is designed for that. Don’t use essential oils and other medicinal additives in a cool mist humidifier or one not built for oils. Check the manufacturer’s guide.

Go Ultrasonic

If you have dry skin, the sniffles, or allergies, and you’re sure the air in your house is a significant factor behind it, then a humidifier is an excellent idea. Or if you simply want a more natural humidity balance in your environment.

On top of that, do you want a safer and quiet humidifier – or even totally silent? Then the best ultrasonic humidifier is the choice for you.

Remember, when looking for an ultrasonic humidifier, consider the humidistat, size of the tank, noise level, and pre-programmed settings.

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About the Author

Matthew Sullivan

Matthew Sullivan is a technical writer with over 15 years of hands-on experience in the realm of HVAC, humidity, air purification, and mold prevention. With a background rooted in mechanical engineering, Matthew seamlessly blends the intricate world of technicalities with the everyday challenges that homeowners and businesses face. His vast expertise has led him to collaborate with leading HVAC manufacturers, consult on cutting-edge air purification systems, and become a sought-after voice on mold mitigation.