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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).
The Thermostat and the Condenser Unit. The thermostat of the walk-in cooler determines the air temperature within it; when the temperature rises above the level of the thermostat, the condenser unit turns on to start a new cooling cycle. The unit's fans pull air into the unit and over the condenser's coils.