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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).
Portable evaporative coolers cool a space by evaporating water into the air as a fine cool mist. The system pulls in dry hot air and passes the air through a moist cooling pad. This pad, or cooling media as it's sometimes called, absorbs water from an onboard water reservoir or pan that you'll fill periodically.