An air cooler is any device for cooling the air inside a building, room, or vehicle. Air coolers are utilized in thermally insulated casings to make refrigerators and also are utilized in buildings to chill rooms. In buildings they are only required when the building itself is not constructed so that it is able to dissipate enough heat. Methods to construct buildings in such a fashion that additional air coolers aren’t required are eg. Earth sheltering or specific building designs.

Several devices exist, these include:

• Wet air coolers
• Dry air coolers
• Absorption air coolers
• Deep water source cooling system
• Ground-coupled heat exchanger
• Air and water-coupled heat pumps