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Most of us know that we can use our ceiling fan to cool a room in the summer. It does this by spinning (typically) counter-clockwise to push cool air downward. However, your fan may have a switch that allows you to spin in the opposite direction to pull air upwards, which pushes the warm air that naturally rises back down.
Typically, most of us use ceiling fans to create a breeze in an otherwise warm room. This cools us off by evaporating perspiration. However, many fan models have a switch that allow the blades to spin in the opposite direction. This pulls the air in the room upwards, which pushes the warm air down the sides of the rooms, making your room a little warmer. This can give your heating unit a much-needed respite during the colder months of the year.
from Lifehacker http://ift.tt/1M1pZ0J
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