An air cooler is a device designed to lower the temperature of the air in a room. It works by using water evaporation to cool the air, making it a more energy-efficient option compared to traditional air conditioning systems. Air coolers are particularly effective in dry climates, where the evaporation process can significantly reduce the air temperature. These devices typically consist of a fan, a water reservoir, and cooling pads. As the fan draws warm air through the wet cooling pads, the moisture evaporates, cooling the air before it is circulated back into the room. Air coolers are portable and can be used in various settings, including homes and offices.