This picture shows a typical window mounted evaporative cooler, also called a swamp cooler. Inside this unit, a centrifugal blower pulls air through the pads of the housing, and discharges it into the space to be cooled through the box-like opening in the front. Switches on the front panel usually control blower speed (HI-MED-LO) and a small pump motor inside the housing. A water line supplies water to a shallow reservoir in the bottom of this unit. As water evaporates, addition of make-up water is controlled by a simple float-valve.
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