How do Dehumidifiers work?

Chendur Singaram
2 min readFeb 7, 2024


The main purpose of a dehumidifier is to reduce the moisture in the air.

Humidity in your room can cause mold and mildew, and your room can feel a bit stuffy.

Damp environments can accommodate dust mites better, which is the leading cause of Asthma. So dehumidifiers remove dust, dirt, and moisture from the air making the environment less comfortable for dust mites. When it’s used in a central location, moisture around the home will be drawn into the dehumidifier.

Here is how it works!!

Source: Inventor
  1. A humidistat monitors the relative humidity in your home. And when this reaches above a certain level like let’s say 30%, the dehumidifier will switch on and begin removing moisture from the air.
  2. The air is drawn from the outside through a fan, which goes through a panel filter that removes dust and dirt.
  3. The air is then cooled, condensing the moisture which is removed and deposited into the water tank.
  4. The dry air is then rewarmed using the heat generated by the dehumidifying process and is passed back into the room.
  5. Once the tank is full of water, it can be removed. Or it can be connected to a drain line for continuous water draining. They aren’t very expensive to run in general.

And this is how it works!

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