system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does pointing a fan outside work better for cooling a room down?

As opposed to pointing it inside, which always seems to feel better.
gpt
A room which has heated up throughout the day can be effectively cooled by moving the hot air to the outside and replacing it with slightly cooler air. The only reason why it feels cool to have a fan blowing on you is due to the latent heat effect of the evaporation of moisture on your body. As the water evaporates, it takes energy from your body in the form of heat which is why wind chill can often make a day seem colder than it actually is.