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

like i understand how a ceiling fan can push hot air where you want i (heat rises etc.) but how does a desk fan which simply circulates air make a room feel colder? does it? is this just an illusion?
gpt
A fan doesn't cool the room (unless it's colder outside, there's an open window or door and the fan helps the airflow through it).

However, we experience heat not necessarily by the absolute temperature of the air around us, but rather by the rate at which heat is exchanged between the air and our skin.

When there's air flow around us, our bodies can get rid of heat more easily, which causes the sensation of cooling.