What is the evaporative cooler?

Evaporative coolers, also called swamp coolers, rely on this principle. By passing outdoor air over water-saturated pads, the water in the pads evaporate, reducing the air temperature by 15°- to 40°F-before it is directed into the home.

What is the major advantage of an evaporative cooler?

Evaporative coolers uses 100% fresh, filtered outside air to cool down a building or room. This improved the indoor quality substantially, especially in compartion with mechanical cooling, which often recirculated the warm, polluted indoor air.