An air cooler is any device for cooling the air inside a building, room, or vehicle. Air coolers are used in thermally insulated casings to form refrigerators and are also used in buildings to cool rooms. Air coolers use a fan to blow hot air through a water-soaked pad. As air passes through the pad, the water evaporates and cools the air. This cooler air is then recirculated through the room.

They help to cut down on allergies as the air is always fresh and never stale or stuffy. These units are highly recommended for areas of high heat and low humidity, a portable air cooler can offer that small bit of moisture needed in the air to make your breathing space easier and more comfortable.