What Is the Best Ultrasonic Humidifier in 2021?

If you suffer from common ailments like dry skin, itchy eyes, allergies or asthma, then you might consider adding a humidifier to your home to control the moisture levels in your air.  This can help to alleviate these problems.  Depending on your personal situation, an ultrasonic humidifier could be a great choice for you.  I particularly like these humidifiers, as they tend to be safe, quiet and fairly low maintenance.

In this article I provide an overall buying guide and research-based product reviews to help you find the best ultrasonic humidifier for your needs.

If you’re in a rush, then my top recommendation would be the TaoTronics Cool Mist Humidifier. I’ll be reviewing that, and each of the following in detail this post. To know the exact price of each humidifier, click the “Check Price” button below each individual review.

Ultrasonic Humidifier Buying Guide

An ultrasonic humidifier uses ultrasonic sound vibrations to make small water droplets that are then emitted as a cool mist into the air. While these humidifiers are often very affordable, they do need to be properly maintained and cleaned or they can develop bacteria. Higher-end models typically include antibacterial features that use a UV light to kill bacteria. Some models also include filters that will remove dust that develops from the mineral content in your water.

Warm vs. Cool Mist

There are pros and cons of both warm and cool mist humidifiers, and it is important that you consider these for your personal needs.

Warm mist humidifiers move water over a heating element to produce hot water vapor. These are typically not safe to have around children or pets, as the hot water can cause serious burns if it spills. Still, warm mist humidifiers are often thought to be a healthier choice, since the heat can fight off mold and bacteria growth. They are also nice to have in the winter since they warm the air in the room.

On the other hand, cool mist humidifiers are safer to have around children and pets. They also use less electricity than a warm mist humidifier.  A cool mist humidifier does needs to be cleaned more thoroughly and frequently, since they can’t kill mold and bacteria the same way that a warm mist humidifier can.

Types Of Water To Use In A Humidifier

Many people simply use tap water in a humidifier, but tap is not always the best choice. Tap water contains minerals that will leave deposits inside the machine and promote the growth of bacteria. Because of this, distilled water is a great choice for a humidifier.  However, if you do use tap water, it is recommended to use a filter or demineralization cartridge. This way, you won’t breathe in the minerals when they are deposited into the air.


When choosing a humidifier, it is important to think about the size of the room so that you pick a model that can effectively disperse mist throughout the area. Some smaller models may be more affordable, but as a tradeoff they will only work in a small room. If you have a larger room, you will want a humidifier that has at least a 1 gallon tank or larger, so it is able to give you the high mist output you need to cover the entire room.


You will find that higher end humidifiers come with a built-in humidistat, which measures the moisture level in the air. This feature allows you to precisely control the humidity level in the room. If there is a digital display, it can also help you set your desired output level.

Auto Shut-Off

When your humidifier’s tank runs low on water, you’ll want your humidifier to shut off automatically. Not only does this protect the machine’s motor from overheating, but it lessens the risk of an electrical fire. If your machine does not have an automatic shut-off feature, make sure it at least has a transparent reservoir, so you will be aware of when it needs a refill.

Digital Display

We already know that a digital display can help you set the right humidity level. However, digital displays can also alert you to the water level in the machine. Further, humidifiers with a remote control will allow you to easily turn it on and off.

The Best Ultrasonic Humidifier Reviews

1. TaoTronics Cool Mist Humidifier

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best ultrasonic humidifier - taotronics

The 4L TaoTronics Cool Mist Humidifier is great for a large room or a nursery. With a quiet operation and a waterless auto shut-off feature, it is safe and silent enough to use in any room.

The included LED display features a humidistat as well as sleep mode that includes a night light. Capable of working for up to 30 hours at a time, the TaeTronics Cool Mist Humidifier allows you to keep your home at a relative humidity between the optimal level of 40 and 60%.

In maintaining optimal humidity levels, this unit helps to prevent cracks in furniture, static electricity, eye and skin dryness, and nasal congestion that can occur when the humidity drops below 30%.

By adding clean moisture to the air, the TaoTronics humidifier uses the built-in humidistat that lets you choose between three mist levels, so you can always set your preferred humidity level.

This is a safe to use unit that will turn off automatically when it runs out of water. I also love that this machine uses microporous cartridges that filter the water of bad odors and microorganisms.

  • Produces a good amount of steam
  • Easy to use LED display and humidistat
  • Quiet operation
  • Auto-shutoff feature
  • Low maintenance and easy to clean
  • The unit produces white dust
  • Opening to the tank is small, making it hard to check for mold and mildew

2. Homech Cool Mist Humidifier

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best ultrasonic humidifier - homech

This is a quiet, ultrasonic humidifier that works for 12 to 60 hours between refills and features a waterless auto shut-off. I like that it comes with a 360-degree nozzle that rotates at a height of up to 24 inches to make sure you get an even level of humidity dispersed throughout the room.

Using smart-air technology, the ultrasonic atomizer vibrates silently to transform water into a soothing mist. You can adjust the level of mist output up to 300 ml per hour.

The Homech Cool Mist Humidifier is a quiet machine that won’t disturb you as you sleep or study, and it is perfect for a baby’s nursery. It also features an automatic shut-off when the water is empty or the water tank is lifted.

This machine also features a dustproof sponge to prevent dust from getting inside the base to help increase the machine’s lifespan. Easy to clean with just a sponge or soft rag, with an easy to access opening allowing you to wipe down the tank’s inside. It also comes with an adjunct brush for cleaning the base.

  • A very quiet unit that will not keep you awake at night
  • Great value for money
  • Easy to use and clean
  • The yellow warning sign is hard to take off cleanly
  • The bottom of the humidifier gets dirty and can be difficult to clean

3. LEVOIT Cool Mist Humidifier

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best ultrasonic humidifier - levoit

Perfect for bedrooms, a baby’s nursery, and large open rooms, the Levoit Cool Mist Humidifier is a 4.5L ultrasonic air humidifier that is super quiet and runs up to 40 hours.

Featuring a bright LED display and one-touch controls, this unit includes a light / display, mist level, humidity level, and timer options. It also comes with an elevated nozzle design that is effective at dispersing mist to fill up a regular-sized room. Plus, the auto shut-off will keep you safe by turning itself off when your water level gets too low.

Not only can the Levoit Cool Mist Humidifier help prevent coughs and colds, but it can also help to neutralize airborne bacteria that is lingering in the air. By adding moisture into the air, it can help your skin feel less irritated and more hydrated in the wintertime. And, it can alleviate your nasal passages from becoming dry, so you can breathe more comfortably.

When you choose the auto mode, the Levoit Cool Mist Humidifier can self-manage its mist output depending on the humidity level in the room. You also have the choice of four mist levels, so you can customize your mist experience. And, it includes a sensor that will display the precise humidity level to help you adjust your mist levels accordingly.

I love the aromatherapy feature, which allows you to create a soothing atmosphere at home, so you can sleep and relax more comfortably. The aroma box is easy to access and allows you to drop in essential oils to make the Levoit Cool Mist Humidifier into an aroma diffuser.

  • A very quiet machine that has a blue light with a nice ambient glow
  • It creates a very visible cool mist and is easy to clean
  • Easy to operate controls
  • Aromatherapy feature for a more relaxing experience
  • It is smaller than some users expected
  • A little on the cheap looking side

4. Everlasting Comfort Ultrasonic Cool Mist Humidifier

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best ultrasonic humidifier - everlasting comfort

This ultra-quiet, high output humidifier comes with an essential oil trap, automatic shut-off, and a nightlight. This large capacity machine comes with a 360-degree rotating nozzle to help you adjust the mist output and control humidity levels. Not only does this help lessen your risk of illness, but it also helps to relieve irritated and dry skin, especially in the winter months.

The Everlasting Ultrasonic Humidifier is an affordable machine with a sleek, modern look. It is designed to be used in a room up to 400 square feet. You can get up to six days of use from each tank before you need to refill it.

The automatic shut-off feature helps you sleep better at night knowing that it will turn off automatically when it runs out of water.

I love the built-in essential oil trap, which allows you to enjoy the benefits of aromatherapy by mixing the strong mist output with your favorite essential oils.

This machine also features a unique filter design that can be cleaned with tap water, so you don’t have to purchase expensive filter replacements. Ideal for offices, dorm rooms, living rooms, and the baby’s room, this machine comes with a blue LED nightlight that gives off a comfortable ambient glow.

  • It performs well and comes with adjustable controls
  • The humidifier has a nice sleek look that works well in any room
  • Unique reusable filter
  • Difficult to clean
  • Poorly designed refill area

5. Pure Enrichment MistAire Ultrasonic Cool Mist Humidifier

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best ultrasonic humidifier - pure enrichment

Featuring a 1.5L water tank, the Pure Enrichment MistAire Cool Mist Humidifier is super quiet and will last up to 16 hours on one tank. Featuring a night light function and automatic shut-off, the MistAire is compact enough to fit on a bathroom sink or kitchen counter. With its quiet operation, it is perfect to use in an office, nursery, or bedroom.

Easy to assemble and use, this machine includes all essential parts which are easy to clean. The 360-degree mist nozzle can be directed towards the areas you want, while avoiding other areas (e.g., with upholstery and electronics). You can choose between low and high-speed settings to easily adjust the mist to fit your comfort level.

The MistAire comes with an automatic shut-off when the water tank is removed or when the water level is low. The optional night light gives you a soothing, ambient glow. Other features include a disk cleaning brush, AC power adapter, and a two-year warranty.

  • Smart design
  • This is an easy to clean unit that comes with a cleaning brush
  • It can hold a good amount of water, so you don’t have to refill it for a few nights
  • The LED light in the button is very bright and does not turn off
  • The unit does accumulate mold and mildew

The Air Control Guy Winner: TaoTronics Cool Mist Humidifier

Of the five products I’ve reviewed, the winner of the best ultrasonic humidifier is the TaoTronics Cool Mist Humidifier. Featuring three mist levels, the 4L TaoTronics Cool Mist Humidifier allows you to set your preferred humidity level in any room. With its quiet operation and waterless auto shut-off, it is safe and silent enough to work in a nursery or bedroom. Plus, the included LED display features a humidistat as well as sleep mode that includes a night light.

Capable of working for 12 to 30 hours at a time, the TaoTronics Cool Mist Humidifier allows you to keep your home at a relative humidity between 40% and 60%.  Importantly, this machine also uses a microporous cartridge that filters the water of bad odors and microorganisms.

Adding clean moisture to the air, this unit helps to keep you healthy, alleviating dry eyes, skin and nasal passages.  Hands down this is my winner for the best ultrasonic humidifier on the market.

If you found this post helpful, you might also like my post on the best whole house humidifiers, which goes into more detail on larger humidifying systems for your whole home.

For more like this, check out our latest posts on Humidity Control (Humidifiers & Dehumidifiers) and Air Purifying.

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1 thought on “What Is the Best Ultrasonic Humidifier in 2021?”

  1. Thomassen Griffin

    This article has great information…thanks for providing such a wonderful Blog

    King regards,
    Thomassen Griffin

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