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You should not use an air conditioner unit in a room without installing it in a window- or rather, it won't be much use. The reason you must install it in a window is because the unit vents waste hot air. Basically, the unit takes in the warmer air of the room, runs it through the cooling system to take out the heat, and returns cool air while venting the heat out the back.
|Jennifer Mathes, Ph.D.|