Air flow from a fan makes the air feel cooler due to convection and evaporation. … The increase in velocity of the air flow from the fan that causes the air to feel cooler than the air going into the fan. The fast moving air increases the rate at which our bodies lose heat due to convection and evaporation.

Do fans actually cool air?

Unlike air-conditioning, a ceiling fan doesn’t actually make the air in a room or space cooler. Instead, the fan cools the occupants in it. … Because a ceiling fan cools occupants but not spaces, it makes sense to turn off a fan in an empty room, unless air circulation is required for reasons other than comfort.

Is it OK to sleep with the fan on?

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.