system
Given the following post, respond as if you're commenting on Reddit:
human
Why does air blowing from a fan feel cooler than air of the same temperature without one?

Why is it a relief to have the usually uncomfortable air blowing in abundance at one's body?  I don't believe fans actually cool air do they?
gpt
Your skin warms up a very thin layer of air right next to your skin. The fan blows that warmed air away, feeling cooler.

Also, your skin has moisture on it. Blowing air across your skin increases the evaporation rate, and that evaporation is an endothermic reaction which uses your body heat, so it draws heat out of your skin.