Best Air Purifier vs Dehumidifier Comparison 2021

An Air purifier and dehumidifier have different woks to do however they both help in minimizing allergens in the room. This will help people suffering from allergies and asthma.

Further, an air purifier passes the airborne particles like smoke, pollens, and dust particles through a filter and trap them inside the purifier.

On the other hand, an air dehumidifier removes moisture from the air to reduce the humidity level in the air. This helps in killing mold and microbes grow under moisture.

Have a look at this comprehensive air purifier vs dehumidifier difference and comparison.

Table Of Content:

Types Of Air Purifier And Air Dehumidifier

Air Purifier:

  • Filter air purifiers: Use a HEPA (High-Efficiency Particulate Air) filter or a ULPA (Ultra-Low Penetration Air) filter to circulate air and trap dust particles from the air.
  • Ionizing Purifiers: It creates a small but powerful electrical field that charges dust particles oppositely to stick together and settle out of the air.
  • Ozone Generators: Changes the oxygen molecules in the air into ozone as ionizing purifiers.
  • Adsorbents: Uses an adsorbent substance to remove odors and smoke from the air.
  • UV Light: Through ultraviolet radiation, it kills micro-organisms sterile.


  • Mechanical /refrigerative: It uses the most common method, the law of condensation. Suck the humid or moist air and pass through a cooled or refrigerated coil with a small fan.
  • Air conditioners: They also use the condensation process by passing humid air through cooling coils and removes the moisture.
  • Adsorption/desiccant: It is a special humidity-absorbing material, that absorbs the moisture by passing the air through it while at lower-temperature. Works best for humidity levels at 35% or below.
  • Electronic dehumidifier: It uses a Peltier heat pump for cooling the surface and then through condensation, removes the water vapor from the air. It’s quieter because of no moving parts. Suitable for smaller places.
  • Ionic membrane: The ionic pump is used to move humidity in or out of sealed places at the molecular level. The device is mainly used in industrial areas.
  • Makeshift: Makeshift dehumidifiers sends the exhausted heat back into the room.

Difference Between Air Purifier And Dehumidifier

Air PurifierAir Dehumidifier
FeaturesCirculate and filter the air by trapping dust, allergens, smoke, toxins, and debris. Removes mold spores.To reduce the moisture content in the surrounding but can not clean the air of toxins and debris and remove mold spores by removing moisture.
TypesFilter, Ionizing, Ozone generators, Adsorbents, UV lightMechanical /refrigerative, Air conditioners, Adsorption/desiccant, Electronic, Ionic membrane, Makeshift
Used ForBeneficial to allergy sufferers and asthmatics as they reduce dust, tobacco smoke, and other airborne allergens.Recommended easing allergy by eliminating mold, dust mites, and mildew from the air.
ProsCleans dust and other microscopic debris. Helpful for people with asthma or respiratory issuesRemoves high levels of humidity and prevent the spread of mold spores.
ConsDoes not remove humidity
and can be noisy.
Does not remove toxins or dust and can be noisy.
Air Purifier And Dehumidifier Comparison Chart

Health Hazards Of Air Purifiers

Many air purifiers generate some ozone, and in the presence of humidity, small amounts of nitrogen oxide. Ozone generators are potentially harmful.

Health Hazards Of Dehumidifier

When you use a dehumidifier, you might need to be especially mindful of staying hydrated. As your skin and hair can be affected because of low humidity levels that promote dryness.

Air Purifier Vs Dehumidifier: Which One Is Better?

Here are some useful tips and features that can be helpful in identifying from Air purifier vs Dehumidifier, which is good for you to use. Below, you’ll find out of these two purifier, which on you choose for mold, smoke, allergies, asthma, basement , and baby.

1. Air purifier or Dehumidifier for mold:

A dehumidifier is a better choice for mold as removes the excess moisture from the air which helps in stopping the reproduction and growth of mold. On the other hand, an air purifier can only trap the mold spores, can not stop the root cause.

2. Air purifier or Dehumidifier for smoke:

An air purifier can help you removing smoke from the air and other air-borne pollutants and irritants like dust and pollen. But a dehumidifier can only remove the moisture and reduces the humidity levels in the air, killing mold and microbes that thrive in moisture.

3. Air purifier or Dehumidifier for allergies:

That depends on the condition of your home and the type of allergies you need to address.

An air purifier is ideal for:

  • Musty mold smell
  • Odors from cooking, pets, or smokers lingers and irritates eyes and lungs
  • Asthma
  • Humidity levels are normal

A dehumidifier can be helpful for:

  • Coastal areas for removing humidity
  • For removing excess moisture from the air.
  • Removes musty smell of mold, mildew, or fungi
  • Can be helpful for respiratory problems due to moisture heavy air

4. Air purifier or Dehumidifier for a basement:

Air purifiers are good for the basement because they can improve air circulation and reduce pollutants such as mold spores and dust. Which results in overall better air quality in the basement. Also, it can benefit even more if the basement has no window.

5. Air purifier or Dehumidifier for baby:

An air purifier or humidifier both can be good for a baby. However, a dehumidifier is recommended when your home has no air condition or the baby is sleeping in a basement. On the other hand, an air purifier can be useful to remove diaper odors or allergens and dust particles with the correct filter for your baby.

5. Air purifier or Dehumidifier for asthma

Both an Air purifier and dehumidifier, help in removing allergens in the room, making it easier to breathe, and can be helpful for people suffering from allergies and asthma.

A dehumidifier sucks in moisture and reduces the humidity levels in the air, killing mold and microbes that thrive in moisture. On the other hand, an air purifier removes the mold, dust particles, and smoke from the air. You can get any of them however, choose the one that suits your needs and budget as well.


Hopefully, you can find the right product that suits your budget and needs this air purifier vs humidifier users guide.

Both a dehumidifier and air purifier are made to achieve different needs. After going through the air purifier vs dehumidifier pros and cons, I hope you have cleared all your doubts and confusions.

Lastly, if you ask me, I would prefer an air purifier on a dehumidifier because these days air pollution is worse and it’s getting difficult to breathe day by day.

However, if you need both of the machines then you can choose an HVAC system to get the benefits of both the air purifier and dehumidifier together.

Please feel free to ask any questions related to air purifiers.

Can you use a dehumidifier and air purifier in the same room?

Yes! You can use both an air purifier and a dehumidifier alongside in the same room. However, keep them at a distance (few feet apart) while using both machines together, so they don’t interfere with each other.

How To Do Maintenance Of A Humidifier?

Maintaining dehumidifiers requires regular cleaning of all its coils and reservoir water tank. Moreover, to maintain efficiency, check these coils for frost periodically.

How To Do Maintenance Of An Air Purifier?

You need to replace the filter every 6 months in Air purifiers to works effectively. If the humidifier has plates, they should be washed once a week. To clean the plates by taking them out from the machine and submerge in a sink or dishwasher.

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