Ultrasonic Humidifier Frequency: Everything You Need To Know

Dry air can be harsh on your nose, mouth, eyes, and skin. Add to that seasonal elements, and conditions can intensify and take longer to treat.

One way to eliminate dry air is to get a humidifier. The best types are those that use ultrasonic technology. The average ultrasonic humidifier frequency is usually above 20 kHz.

It can be hard finding the best humidifier for your home or work. So we put together a list of the top five ultrasonic humidifiers.

But first, let’s talk about how they work.

Table of Contents

How Ultrasonic Humidifiers Work

Humidifiers work to reduce dry air in a room. They reduce nose bleeds, dry skin, chapped lips, dry throat, nasal congestion, and even allergies.

The way ultrasonic humidifiers operate is through a diaphragm piezoelectric transducer. The diaphragm vibrates at various frequencies. It’s this vibration that circulates ultra-fine clean cool mist into the air.

Best Ultrasonic Humidifier Frequency

The best types of humidifiers vibrate at various frequencies. The frequency of a humidifier is measured by how many cycles it vibrates per second. It’s measured in hertz (Hz), or one cycle per second. kHz is 1000 cycles per second, and MHz is 1 million cycles/second.

The best ultrasonic humidifier frequency is between 0.8 MHz to 1.7M Hz. Frequencies in this range don’t pose any danger to us, as long as they don’t go near 30 MHz.

Low frequencies (from 1 to 300 Hz) can result in headaches, nausea, and dizziness. They also may cause damage to the humidifier itself.

Evaporative Humidifiers vs. Ultrasonic Humidifiers

Both types of humidifiers provide you with a fine mist and reduce dry air in the room. It’s important to know how each type operates so you can choose the best for your needs.


Just as their name implies, these work through an evaporation process, rather than a spray-and-mist. A wick filter absorbs water, which then evaporates with the help of a fan.

Some of the advantages are its low price. Plus, the wick filter prevents the release of bacteria. The downside is that you need to change the cloth frequently.


Sometimes called ‘cool mist’ humidifiers, they depend on high-frequency technology to spread the mist.

Contrary to evaporative humidifiers, these produce less noise and are more energy-efficient. Their downside is that they can release mold and bacteria with the water mist.

The quality and type of water play a big part here. Using tap water can diffuse bacteria and mold into the air. According to the EPA, distilled water is the best water for humidifiers.

What to Look for in Ultrasonic Humidifiers

Some main features to look for when buying ultrasonic humidifiers.

  • Size of the water reservoir
  • How long it can operate non-stop
  • A humidity monitor (humidistat)
  • Pre-programmed settings, such as a timer and humidity level controls
  • Adjustable nozzles
  • The design and size to best suit your home

Benefits of Ultrasonic Humidifiers

Here are just some of this unit’s many benefits.

  • Help you sleep better
  • Don’t make noise
  • Clear up your sinuses
  • Keep your skin moisturized and supple
  • Consume low levels of energy
  • Provide safe and reliable features

The 5 Best Ultrasonic Humidifiers

These are our top 5 picks for best ultrasonic humidifiers

1. TaoTronics Cool Mist Humidifier

Ultrasonic Humidifier Frequency - TaoTronics
This humidifier has a capacity of 4 liters. It can operate throughout the night with efficiency in rooms 107 – 322 feet2 with little noise. It has a built-in humidistat that displays the humidity level on an LED display.

It provides you with three different mist levels and various humidity levels. The nozzle provides 360° for optimal coverage. There’s an optional nightlight. Plus, if you want to turn off the LED screen, go into sleep mode. Its size is 8.1×5.3×11.8 inches, and is powered with a 5-foot power cord.


  • Comes with an air filter
  • Has a built-in humidistat
  • Works at less than 38 decibels (dB)


  • Some users complained of a musty smell coming from the humidifier

2. Pure Enrichment MistAire Ultrasonic Cool Mist Humidifier

Ultrasonic Humidifier Frequency - Pure Enrichment

This humidifier can safely operate for up to 16 hours on its 1.4-liter tank. It’s perfect for medium-sized rooms of up to 250 feet2. Its 360-nozzle guarantees even mist dispersal.

Once the water starts running low, the humidifier automatically shuts off. It provides you with four mist levels. There’s also an optional nightlight. You can use it to give a soft glow while you sleep.

The MistAire humidifier comes with a disk cleaning brush. Use it once a week to remove dust on the ultrasonic disk to boost its efficiency. Its size is 8×6×9 inches, and it’s powered by an AC adapter.


  • Low noise levels
  • Comes with a dust brush


  • Doesn’t come with a filter

3. LEVOIT Humidifiers for Bedroom

Ultrasonic Humidifier Frequency - Levoit

The LEVOIT 2.4-liter humidifier is safe for use in your bedroom, office, or nursery. It has an automated shut-off feature when water levels drop or when you open the humidifier. Another safety feature is that it’s BPA-free.

Its exclusive low-sound design means the noise level is less than 30 decibels. It comes with a cleaning brush for removing debris build-up. You can choose between three mist outputs, and change their direction with the 360-nozzle. It can humidify a room up to 290 feet2 for up to 24 hours continuously on a full tank.

There’s an optional nightlight that gives off a soft blue glow. This humidifier’s size is 8.5×6.7×10.2 inches. It’s powered by a detachable power cord.


  • Made with patented silencer
  • Has a watertight protection design
  • BPA-free
  • Low noise levels


  • Some users complained it’s hard to use and maintain
  • Doesn’t come with an air filter

4. Homech Cool Mist Humidifier

Ultrasonic Humidifier Frequency  - Homech

The Homech humidifier has a 4-liter water tank. It can run continuously for 12 – 60 hours on a full tank. The 360-nozzle makes sure the mist is evenly distributed. There are several mist levels to choose from.

It’s designed with dust-proof sponges to keep noise levels down to 30 decibels. They also keep dust and debris to a minimum. It turns off automatically when water levels are low.

This humidifier comes with a cleaning brush. Its dimensions are 10.2×6.5×13.3 inches. It’s powered by a 5-foot power cord.


  • Easy to clean
  • Comes with dust-proof sponges on the humidifier basin
  • Low noise levels
  • Comes with a cleaning brush


  • Doesn’t come with a filter

5. GENIANI Ultrasonic Cool Mist Humidifier

Ultrasonic Humidifier Frequency - Geniani

The GENIANI 3-liter humidifier is able to provide relief from dry air for medium-sized rooms up to 199 feet2.  It can operate for 12 hours, and 24 hours for smaller rooms. Its spraying technology and 360-nozzle make sure the mist spreads evenly throughout the room.

It has an auto-shutdown feature, an optional nightlight, and is BPA-free. You can choose between various mist levels to meet all your needs.

Its dimensions are 8×8×12.5 inches, and it’s powered by a 16-inch power cord.


  • T-spraying technology
  • BPA-free
  • Low noise levels
  • ETL-certified


  • Consumes too much water


Ultrasonic humidifiers are easy-to-use, practical, and highly efficient. They can be used year-round, especially since the ultrasonic humidifier frequency is harmless.

Our top pick is the Pure Enrichment MistAire Ultrasonic Humidifier. Compared to bigger humidifiers, it has an average-sized tank. Yet its reliable features, such as the 360-nozzle, auto shutdown, and compact size, guarantee optimal relief from dry air.

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