3 Differences Between Air Purifier and Dehumidifier

air purifier vs dehumidifier

Air purifier and air dehumidifier are both common devices in our daily life, they both have the effect of improving the air, while they are so different in three ways, principle, purpose, performance, what is the difference between an air purifier and a dehumidifier? Let's take a look at the difference between air purifier and dehumidifier.

 air purifying

Basic Descriptions of Air Purifiers and Dehumidifiers

Air Purifier

The role of an air purifier is to capture particles, allergens, pet dander, and other air pollutants, thereby purifying the air. The purified air can make breathing easier, especially for those with allergies and asthma. Additionally, air purifiers can effectively reduce household odors.


The role of a dehumidifier is to remove excess moisture from the air, serving as an effective humidity control device. By reducing the moisture in the air, it helps control mold growth and musty odors. High humidity can also lead to allergies and health problems.

Is an Air Purifier the Same As a Dehumidifier?

Not really, they both work on air quality improvement, while there are 3 main differences, as following I listed:


3 Main Differences


Air Purifier Working Principle:

The air purifier adopts the principle of filtration. The indoor impurities is sucked into the air filter, and then the action of the filtration system will adsorb the tiny particles and odor gases, and decompose them into carbon dioxide and water.


Dehumidifier Working Principle

The dehumidifier sucks indoor air through a fan, and the compressor inside will condense the moisture into water and collect it into the water tank. With the extension of the use time, the humidity in the air will be reduced to a proper level. This is similar to the dehumidification purpose of an air conditioner, but the performance of a dehumidifier is more efficient.



The main air purifier purpose is to remove impurities in the air, for instance, remove odor, dust, second-hand smoke, bacteria, mold, pollen, and even remove formaldehyde. etc.

The purpose of dehumidifiers are mainly to reduce or stabilize the humidity of indoor air. Some dehumidifiers can even control the air humidity within a certain range.



Air purifiers can filter toxic and harmful impurities in the air. While the dehumidifier absorbs a part of the moisture in the indoor air to reduce the humidity, but cannot purify the air.


There’s a silver ion filter at the air inlet of dehumidifier, which mainly performs simple filtering of hair fibers and dust, and is a part in sterilization, but this effect is still different from the purification effect of the air purifier.



Difference Between Air Purifier and Dehumidifier


Air Purifier






To purify the air, remove odor, dust, second-hand smoke, bacteria, mold, pollen, formaldehyde, etc.

Adjust air humidity


Filter toxic and harmful substances in the air

Absorb some of the moisture in the indoor air


Do Air Purifiers Work as Dehumidifier?

No, Air purifier doesn't have the function to dry air, or humidify air. While you can use an air purifier and dehumidifier in the same room without any problems. The two devices work together without inhibiting the performance of the other. Keeping these units in your home kills and prevents mold, musty odors, and bacterial dust mites.


The Cooperation Process of Air Purifier and Dehumidifier

When powered on, the air purifier works by removing dust, pollen, odors, pet dander, bacteria and allergens from the room. It will circulate fresh air through the filter and trap pollutants in the air. Once it removes harmful particles from indoor air, it purifies and cleans indoor air.


At the same time, a dehumidifier will remove excess moisture from the air. It will prevent pollutants from surviving in the air. The device also helps decrease the growth and spread of microorganisms. You can breathe comfortably without worrying about the microbes that cause asthma or allergies.


Best Time to Use the Both Machines

A typical example when using a air purifier and dehumidifier is in the basement. Most home basements feel less hospitable and musty. The smell may be due to humidity, which can lead to mold growth. In this case, you can address damp, moldy odors and by using an air purifier and mold dehumidifier. A dehumidifier will help remove excess moisture and control the spread of mold. It will also keep the humidity in the room at about 40%.

 Air purifying

If the moisture problem has worsened, or the mold problem has been going on for a long time, this is where you should run your air purifier. The unit will capture harmful contaminants that cause musty odors, including bacteria and mold spores. Even if you decide to wash the mold, the act of removing it will expel its spores and send them into the air, so an air purifier is needed to keep them from drifting from room to room.


Understand that using two machines at the same time will only work well if you have extreme dumping and wet issues. If the climate is not humid, it will not cause moisture. In this case, there is no need to use a dehumidifier. However, an air purifier will be needed to clean the air.



There are many differences between air purifiers and dehumidifiers. As to improve the indoor air environment, it is necessary to choose one according to your actual needs. While you can use both an air purifier and a dehumidifier in the same room. An air purifier will help clean the air, while a dehumidifier will remove excess moisture from the air. As these units work together, they will eliminate dust mites, mold spores and other microbes that can cause health problems.


To choose a reliable air machine supplier, it is necessary to focus on the qualification, to make sure their products are qualified to use in your home, MSPure has passed ISO9001, CE, FDA and NSF certification early in 2013, is one who can provide both massive orders and small orders, all of our machines takes the HEPA filters. If you are interested in air purifier machine, don’t look further, come to contact us.

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