California Route 66 photographs
"Swamp Coolers" are a common device for cooling the air inside homes in the dry, hot southwest. Water soaks pads located in the device and a large fan blows over the pads, evaporating the water and cooling the air in the home by about 20 degrees, as well as adding a little humidiity to the interior.
"Swamp cooler" at San Bernardino, CA
"Swamp cooler" on motel roof, San Bernardino, 2000

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