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In response to "I would think in winter you want to pull the warm air already at the ceiling down to the cool floor, but this is why I don't understand how it makes a -- nm" by difference.

by pulling the air up it forces the warmer air at the ceiling down along the walls. But if you have it blow down you will feel a breeze so you would

likely feel colder even though the warmer air is still being brought down

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