Do Hand Fans Make You Hotter. Fans in windows can blow cooler air into a room from outside. Similarly even without sweat our body loses heat to the surrounding air simply.
If you put a fan in an enclosed box and have two temperature sensors one inside the box and another one outside and run the fan on high setting. The important part about a fan is that it moves the air which speeds up evaporative cooling on your skin as it dries up sweat. So a fan does not cool the room at all.
Muscles are only about 20 per cent efficient.
Some people say fans actually add more heat to a room. In situations like this when there is more humidity the evaporation off your skin is slower than normal. Does a hand held fan actually cool the person using it. If you measure the electrical power going to the fan through the electrical cord it will be equal to the heat added to the room.
