#DIYDiaries Use Your Exhaust Fan In Reverse To Cool The Indoors


Image Source: Public Domain Pictures

Have you noticed that on some nights while it is pleasantly cool outdoors, your room still feels hot and stuffy? What if I tell you there’s a simple way by which you can make your room as cool as your terrace? Interested?

Here’s How To Do It

To get the cool terrace or outdoor air in your room and make it less stuffy, all you’ll need is an exhaust fan. Yes, the same ones that drive out stale warm or humid air from your rooms or bathrooms. While an exhaust fan can produce a similar effect, it doesn’t control the area from where the fresh air comes in. If the fresh air comes in from your house’s interior, as it does in my case, it will take a very long time to cool your room. The air on the terrace above my room was nearly 10 degrees Celsius cooler. And a house in the front blocks the wind to my room’s windows. To solve that, I have mounted an exhaust fan in the reverse direction on one of the windows so that it will draw cooler air from the outside and force ventilate the room.

The exhaust fan needs to be in the opposite direction so that it faces your room’s indoors. The interiors have definitely become cooler, specially on rainy days. I do not have to use the air conditioner on such days and it saves a lot of energy and carbon.


Do not leave the sides of the exhaust fan open. Image Source: Author’s Own.

Things To Note:

  1. Make sure the immediate surroundings of the exhaust fan are covered. The air might re-circulate back through the gaps.
  2. Make sure there is a path for cross ventilation at the opposite end of the room.
  3. It is better to close the windows near the exhaust fan. You’ll get the best effect when the cool air passes through the room and goes out the other side.
  4. Don’t close all the doors and windows and turn on the fan – it will create high pressure inside.
  5. A larger exhaust fan will drive more air in and work better, but it might be noisier. But would you mind more fresh air?

Exhaust fans consume less than 100 watts while home air conditioners consume somewhere between 1000-2000 watts. Please note that this is not a replacement for air conditioners, it will help only on days when outside temperature is comfortably low. Another thin is that it won’t really improve your conditions of humidity, but can help by bringing in some cool air.

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