One direction makes it a lot cooler than the other.
In: Physics
The main thing that matters is if you want the air blowing on you, or not. In the summer if it is hot, you probably want the fan to push the air down at you, because it will feel like a nice cool breeze.
In the winter, you don’t want that cool breeze, so turn it the other way to it blows ‘up’.
When the fan is working, it circulates all the air in the room. The air basically does a big circle from floor to ceiling and back to floor. So a fan mixes the air in your room, no matter which way it turns.
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