What is the difference between a hot and a cold air register?

Hot air registers are referred to as the supply. This is where the air comes out of the system, whether it be the air conditioned air, or the warm air from the furnace. Cold air registers are referred to as the returns. This is where the air enters the system and is drawn towards the blower fan, which sends the air back through the supply.

Hot air vent and cold air return

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