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The 1986 edition of Dr. John Watt's Evaporative Air Conditioning Handbook identifies the origins for modern American evaporative cooling as either from the East Coast or Southwest. In the early 1900s, air washers were invented in the East and air coolers were developed in Southwest (Arizona and California).
A certain amount of the water evaporates, cooling the air, which is then blown through the house as a crude form of air conditioning. An even cruder form of this cooling system was invented by Native Americans in the Southwest. Refrigeration, of course, is true central air conditioning.