system
Given the following post, respond as if you're commenting on Reddit:
human
How does an electric fan cool down a person/room?

I was thinking about it earlier and couldn't work it out.
gpt
An electric fan does not cool down a room. Think about it, if you had a perfectly sealed room with only an electric fan in it powered by electricity, this electricity feeding the fan eventually will get converted into heat. 

So the fan does not cool down the room, but it does create a wind chill effect. A wind chill effect refers to how the wind increases convective heat loss. By blowing the surrounding air around your body, it makes the evaporation of sweat from your skin an easier process, this is how your body gets rid of heat. 

More air circulation means more evaporation, resulting in a better cooling effect.