In the summer, why do you want to pull hot air from the ceiling downwards instead of pulling up colder air to the ceiling?
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As the ceiling fan pushes the air down, the air that’s already on the ground gets squashed and moves up along the walls. Where it then gets pushed down by the ceiling fan. This process repeats.
It’s like stiring a cake mix. As you push the cake mix through the middle of the bowl, the cake mix in front of the spoon moves along the side of the bowl, to fill the space behind the spoon.
As the air flows over you it cools you down. The temperature difference between the cool air at the floor and the warm air on the ceiling is not that much anyway.
This assumes a somewhat airtight room, in reality the air will move around a little different depending on the room.
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