Ultrasonic vs evaporative humidifier

Even if you live in your clean and well-settled house, there are possibilities that the air you’re breathing may not be as pure as it should be. Breathing bad air is not only harmful to you and your family’s health but it also harms the other aspects of your house in the long run.

People usually do not consider the fact that inside pollution is a thing and should be eliminated to the fullest. When it comes to eliminating the bad air, humidifiers are the best solution. Humidifiers can improve the air quality of your home and the probability of pollution will be mitigated to almost zero.

Ultrasonic humidifiers and evaporative humidifiers are the two major competitors in this field and they can put the buyer into confusion while deciding to buy one for the house. This article will provide you with the most beneficial and useful information to help you buy the best product for your house depending on your requirements. 

What is an ultrasonic humidifier?

What is an ultrasonic humidifier

Ultrasonic humidifiers work with the help of a high-frequency vibrating element. This element transfers the water vapors to the air and they evaporate from the air. The uniqueness of an ultrasonic humidifier is that there is no heating process at any point in its whole mechanism. Ultrasonic humidifiers are also known as “Cool Mist Humidifiers” because of their heatless processing.

What is an evaporative humidifier?

What is an evaporative humidifier

An evaporative humidifier does not transfer the water into the air, instead, it evaporates the water inside the humidifier and then drives that vapor into the air. Two major mechanisms work on evaporating the water inside the machine.

Some of these humidifiers use steam to evaporate the water known as the “Warm Mist Humidifiers”. The second mechanism utilizes a fan that blows air on the filter containing water, the blow of the cool air on the filter helps the water to evaporate.

The basic thing you should know about evaporative humidifiers is that all the evaporation process takes place inside the machine. So, do keep this fact in mind that any substance or particles that were in the water will remain in the tank of the humidifier. 

Evaporative vs Ultrasonic Humidifier

When it comes to comparing ultrasonic vs evaporative humidifiers to get the best one, there are some factors that should be focused on. Below mentioned factors will not only help you to know about the humidifiers in the best way but to decide and buy the one that is most suitable for you in all its aspects. The factors that need your consideration include:

  • Cost
  • Appearance and Size
  • Noise
  • Mineral Deposits
  • Care, Cleaning, and Maintenance
  • Life


Price is usually the first thing that a buyer looks at. In this comparison, the price difference is not that much. You can get an ultrasonic humidifier for a moderate size room of about 500 square feet for $75 while an evaporative humidifier will be available at $50 for a room of the same size.

Appearance and size

If you want to get the benefits of a humidifier without compromising on the aesthetics then an ultrasonic humidifier is the best option. Usually, it comes in a teardrop shape with LEDs and beautiful features. The LED lights may disturb you at night while sleeping.

On the other hand, evaporative humidifiers are a bit large in size because they have to include various components such as filters, fans, etc.


An ultrasonic humidifier will make much less noise as compared to the evaporative humidifier. Evaporative humidifiers include fans that emit light noise. So, if you are going to keep the humidifier in your bedroom then ultrasonic is the best option but if you are going to place the device in an open or large room then an evaporative humidifier can be a great choice. 

Do keep this fact in mind that ultrasonic humidifiers have high-frequency vibrating elements that cannot be heard by humans but can be disturbing for your pets. 

Mineral deposits

As there is no filter in the ultrasonic humidifier, all the substances in the water are vaporized in the outside environment. You may often see a layer of dust or something around the humidifier especially if you use hard or tap water. This can be harmful to the person who inhales air in that room.

The best solution to this problem is to buy an evaporative humidifier as it includes a full-fledged filter. The filter ensures that all dust particles and substances are kept trapped inside the unit without polluting the outside air.

Care, cleaning and maintenance

Dust particles are transferred outside in the room environment if you have an ultrasonic humidifier. This can form a white or grey layer of dust on your furniture and other accessories of the room. To take care of this issue, it is recommended to use pure or distilled water so that this dust can be avoided to a greater extent. As there is no filter in ultrasonic humidifiers they don’t require much maintenance and can work for a long time without any touch.

Evaporative humidifiers include a filter that blocks the dust from going outside and keeps your room clean and clear. When it comes to maintenance, you are required to replace or clean the filter periodically so that the humidifier can work to its fullest.


If you take good care of your humidifier, remove the mineral deposits every few days, and maintain all components such as replacing the filter at the time, both of these humidifiers can easily live up to 5 years without any hassle.

The Bottom Line:

If you want to get rid of cleaning the filter and need a quiet humidifier then go for an Ultrasonic Humidifier. Evaporative Humidifier is the best suitable option if you want to get the air of high quality at a low price. Do keep this fact in mind that evaporative humidifiers may require to change the filters periodically to work properly and efficiently. Choose the one that falls perfectly on your requirements’ scale.

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