Evaporative Air Cooler

Evaporative air coolers is one of the longest history home appliance, even elder than air conditioner. It is called desert cooler in Middle East, and also is called swamp cooler in US. The frame of evaporative cooler is very simple. Water from the bottom pan of the unit is pumped to the top and allowed to flow down over the evaporation cooling pads of the spot cooler, evenly saturating the pads. Then, a powerful blower pulls air through the pads, forcing the water to evaporate which lowers the ambient temperature. The cooler air is then blown by the unit at a high velocity where you direct the cool air to go.