An air cooler is a heat exchanger used to cool and/or dehumidify the air. An air cooler can, for example, be copper or steel pipe onto which aluminium fins are fitted. The cooling medium flowing through the heat exchanger cools the aluminium fins, where heat is exchanged between the cooling medium and the air.

An air conditioner circulates the internal air of the room over and over again, whereas an air cooler pulls fresh air from outside and then cools it down. Also, air cooler doesn't make the air overly dry like an air conditioner. Because of the way it operates, an air cooler offers better quality of air for your room.