Myth: Fans Keep a Room Cool Fans dont make a room any cooler, they merely make you feel cooler. By moving air over your skin, a fan can lower your body temperature, but will do nothing for the heat inside a room. So if youre not in the room, youre just wasting energy by leaving the fan on.
Do fans actually cool down a room?
Unlike air-conditioning, a ceiling fan doesnt actually make the air in a room or space cooler. Instead, the fan cools the occupants in it. The breeze from a properly sized and placed ceiling fan cools occupants by disrupting the stagnant layer of air that surrounds the body, preventing heat loss.
Should you leave fans on when not home?
A ceiling fan doesnt cool the air, it only moves the air around. Therefore its only beneficial to run the ceiling fan when there are people in the room to feel the breeze. In most cases, you should only turn ceiling fans on when people are using the room.
Should you have a fan blowing on you at night?
The fan is a cost-effective way to keep you cool during the hot and humid summer nights. But sleeping with the fan on may trigger congestion, dryness, sore muscles, or allergic reactions in some people. If you have allergies but sleep hot, try using air filters and humidifiers to reduce symptoms of allergies.