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If you ve ever tested the wind by holding a wet finger in the air, you ve used evaporative cooling. The same principle cools you off after a swim, and it also powers one of the oldest and simplest forms of air conditioning. Known in the U.S. as swamp coolers, modern evaporative coolers can trace their lineage to ancient Egypt..Shop our selection of null in the Heating, Venting Cooling Department at The Home Depot..Evaporative coolers, alsoed swamp coolers, combine the natural cooling properties of water with a steady breeze to lower indoor temperatures..An evaporative cooler is a device that cools air through the evaporation of water. Evaporative cooling differs from typical air conditioning systems, which use vapor compression or absorption refrigeration cycles. Evaporative cooling works by exploiting water s large enthalpy of vaporization. The temperature of dry air can be .