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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).
Leonardo da Vinci at the beginning of the 16th century was credited with inventing the first hygrometer that used a ball of wool to provide this indication of humidity level. First Mechanical Air Cooler. Da Vinci was likely the first to use a mechanical air cooler. This air cooler consisted of a hollow water wheel with an air passage constructed to guide the air from the water wheel to his patron's wife's boudoir. The air was cooled by the splashing and evaporation of water during operation of the water wheel.