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. | 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. |