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cra3ig t1_iukb8hs wrote

Reply to comment by eejjkk in LPT: It’s that time of year where the seasons change. If you’re in the northern hemisphere, change the rotation direction of your ceiling fans to pull air upwards and if you’re in the southern hemisphere, change the direction to push air downward. by intellifone

It does seem to make more sense that way, but OP is right.

Summers, you're pushing the warmest air down at you. But it's the breeze effect that directly cools you, and accelerates the evaporation of sweat. Same as any other fan. The displaced air near the ceiling is replaced by air coming up alongside the perimeter walls.

Winters, you don't want that. By drawing air upwards, it spreads across the ceiling - displacing and driving the warm air there outward and then down the perimeter walls, mixing with and warming the room air there. Reducing temperature stratification with no draft.

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