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The air outside is cool, the air inside is warm. Room has two windows. I want to put a fan on one of them to cool down the room. Is it more effective to place it pointing outwards (to suck the hot air out) or inwards (to suck the cool air in)?

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The air outside is cool, the air inside is warm. Room has two windows. I want to put a fan on one of them to cool down the room. Is it more effective to place it pointing outwards (to suck the hot air out) or inwards (to suck the cool air in)?	1994