Swamp coolers

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Swamp coolers, also known as evaporative coolers, are inexpensive air-conditioners that remove heat by evaporating water.
Swampcooler1.jpg

Evaporative cooling techniques are most commonly found in warm, dry climates such as in the Southwest where the humidity is low, although they are found throughout the country. They usually work by spraying cool water into straw, cooling the air as the spray evaporates. They are much cheaper than refrigeration units.

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