Evaporative cooling is a method of converting hot air into a cool breeze using the process of evaporating water. It is similar to the cool refreshing effect you feel when you immediately step out of a pool on a warm summer day and feel a light breeze of air. Evaporative coolers, or swamp coolers, utilize the natural process of water evaporation along with an air-moving system to create effective cooling. Fresh outside air is pulled through wetted filters that cool the air through water evaporation. A blower wheel then circulates the cool air throughout a room, home, or business. We sell great products from Champion, Essick and Tradewinds along with all replacement parts for these coolers.