Air Purifier vs Dehumidifier – Which One is Best for You?

These two machines play significant roles in improving the quality of air in your home. However, they function differently.

Air purifying system and dehumidifiers reduce the spread of allergens in your living environment. This way dehumidifiers are beneficial to individuals with allergies and asthma.

The air purifier causes more air to flow around the room with the use of a filter which commonly captures air-borne pollutants and causes of irritation like smoke, dust, and pollen.

An air dehumidifier, on the other hand, collects excess moisture in the air and minimizes the level of humidity in the air. This way, it kills molds and other microbes by making the environment unsuitable for them to thrive.

Comparing air purifiers and dehumidifiers

1. Application

Air purifiers are helpful to individuals who suffer from allergy and asthma. They help to minimize or get rid of dust, smoke from tobacco and other allergens that are airborne.

Dehumidifiers on the other hands also alleviate allergic symptoms. They do so by getting rid of mold, dust mites and air mildew.

2. Purpose

Air purifier circulates and filters the air by entrapping smoke, dust, and other allergens.

A dehumidifier minimizes excess moisture in the air around you and makes it less possible for molds to grow or thrive.

3. Features

Air purifier eliminates poisonous gases and debris out of the air around you, traps molds spores and eliminates them but it doesn’t work great for minimizing the moisture level.

The Dehumidifier on the flip side does less to eliminate poisonous substances and debris out of the air in your surrounding. However, just like the humidifier, it removes mold spores and at the same time rids the air of excess moisture content.

4. Pros and cons of Air purifier and dehumidifier

Air purifier’s pros

  • Eliminates dust from your living environment and as well get rid of other microscopic waste
  • It is very helpful for asthmatic patients and people with respiratory diseases.

Air purifier’s Cons

  • It doesn’t reduce excess humidity
  • It makes a lot of noise during operation. However, some models make less noise. Check with the customer services to confirm the noise level is suitable for you before you buy.
  • Ionic air purifiers commonly release gaseous ozone to help to minimize bad smells. However, these are a relatively small amount of ozone which may not be injurious to health. Other types of purifiers also release a minute amount of nitrogen oxide when they operate in a humid environment.

Dehumidifier’s Pros

  • Minimizes excessive humidity in an environment
  • Helps to prevent the spread of mold spores

Dehumidifier’s Cons

  • Does not eliminate poisonous substances or dust
  • They are commonly noisy although the models are less noisy.

5. Function

An air purifier purifies the air around your environment by causing air to flow through a filtering system. This helps to get rid of airborne pollutants such as particles of smokes and dust. They also help to eliminate pollen while a dehumidifier doesn’t perform this function. A purifier can also inhibit the build-up of molds by eliminating mold spores. But because it is incapable of eliminating excess moisture from the air, it can’t completely eliminate mold, especially, when the air moisture increases again.

The primary function of a dehumidifier is to get rid of excess moisture and lower the level of humidity in a home. It doesn’t regularly purify the air. However, it helps to minimize the spread of allergens such as dust mites and mold which need a moist atmosphere to breed. By reducing the humidity level below fifty percent, it kills the allergens as they can thrive under such conditions.

6. Types

Types of Dehumidifiers

1. Mechanical /refrigerative dehumidifier

This operates by circulating moist air across a refrigerated coil that has a miniature fan. This way, it collects are that condenses. It works better with high levels of ambient temperature and when the relative humidity of a room is above forty-five percent.

2. Makeshift or Air conditioning dehumidifiers

This type of dehumidifiers conditions air while at the same time working as dehumidifiers.

These are commonly window side air conditioner units that work like a mechanical/refrigerative dehumidifier. They commonly work by transferring or recycling back their exhaust heat into the room.

3. Adsorption/desiccant dehumidifiers

This type of dehumidifiers makes use of a specific material that absorbs humidity pass it across a belt that contains air with the temperature less than the temperature the air that it is purifying.

The air is recircled once the humidity level is lowered to thirty-five percent or more. 

4. Electronic dehumidifier

The electronic dehumidifier makes use of the Peltier heat pump to create a cool surface that makes the water vapor in the air to condense. It is a very quiet type as it doesn’t feature a moving part. However, the efficiency level is low and is suitable to be used with smaller humidifiers.

5. Ionic membrane

This type of dehumidifier makes use of a special type of ionic membrane pump to shift humidity inside or outside a sealed container at the molecular level.

The machine is commonly utilized in industrial environments where they help to improve the application of fuel cell, chemical, or water. This type of dehumidifier is more complicated and commonly utilized for commercial purposes. It makes use of an ultra-modern ionic membrane to filter the air and lock-in water.

Types of air purifiers

The two most widespread humidifiers are those that use warm mist and cool mist systems. Irrespective of the type of mist they use, their primary function is to improve the moisture and the level of humidity in an environment.

1. Filter air purifiers

This type of purifiers either make use of a HEPA (High-Efficiency Particulate Air) filter system or a ULPA (Ultra-Low Penetration Air) filter system to transmit air and entrap particles of dust. They type that is most commonly used to make use of the HEPA air circulation system and release purified oxygen.

2. Ionizing purifiers

Ionization purifies make use of corona discharge system to purify the air. These a minute and powerful electrical field that produces and utilizes oppositely charged particles to gather air and purify it.

3. Ozone generators purifiers

Ozone generating air purifiers function similar to the ionizing purifiers. They convert the molecules of oxygen in the air into ozone.

4. Adsorbents purifiers

The adsorbents purifiers work by making use of adsorbent material to trap and eliminate unwanted odors, smoke pollutants, debris, and fumes.

5. UV Light purifiers

This types of purifiers sterilize a few types of micro-organisms found in the air with the use of ultraviolet radiation. They trap soiled air and destroys the germs and microscopic organisms in the air with the use of very strong UV radiation.


You can maintain a dehumidifier by regularly washing up its coils and buckets. You also need to investigate if frost is on the coils to ensure it functions efficiently.

For air purifiers maintenance, you need to replace the filter once in six months.  Those that come with plates need to be cleaned weekly. You need to bring the plate out and either sticks it into the dishwasher or wash it manually in the sink.


We have provided in this article a good comparison of Air purifier and a dehumidifier. We hope the information helps to know what is suitable to use at any given time and also the best of each type to use at such moments. Do not hesitate to give us a shout if you get stuck while shopping around!

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