An air cooler is a device that cools the air inside a building, room, or car. Air coolers are used in thermally insulated rooms to form coolers and are also used in buildings to cool rooms. Air cooling is a method of heat dissipation. It works by widening the surface or increasing the airflow over the object to be cooled, or both. An evaporative cooler is a device that cools the air by evaporating water. Evaporative cooling is different from other air conditioning systems.