I know that one way the fan spins is supposed to push air down to cool the room, but why would you want to reverse the direction to push air towards the ceiling?
I know that one way the fan spins is supposed to push air down to cool the room, but why would you want to reverse the direction to push air towards the ceiling?
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Maybe you have windows open and want to draw air into the room through them.
Because the air along the floor is cooler.
Hot air rises and this is increased if you’re under a weakly isolated roof (so that the heat from the sun on the roof increases the heat further).
In order to cool down the interior you try to push the hot air out of the building and preferably pull in cool air from cooler underground channels.
Hot air rises so in the winter you want to pull the hot air from the ceiling, in summer you do not want to do that because it will become hotter in theory.
In practice: most rooms don’t have high enough ceilings for it to make noticeable difference besides disrupting the insulating layer of air around your body
Both directions circulate air. Pushing air down has the added benefit of feeling the breeze, so that’s good in the summer. In the winter you still want to circulate the air, since hot air rises, but may not wanted the cooling effect of the breeze. So flip the direction, breeze hits the ceiling and then down the walls, circulating the warm air around.
Hot air rises. If you’re ever on top of a ladder inside, especially in a high-ceiling room, you’ll notice that the air up there can be 5 degrees warmer than on the floor. A fan pointed up will circulate that air down to the bottom, without creating a noticeable breeze (which is the point of a downward facing ceiling fan). Might not be worth it in a 8 ft tall bedroom with good insulation, but pretty much every large warehouse has something similar.