The air is really drawn in by the blower in the primary device and pressured through the cooling coils. The cooling coils are chilled by the refrigerant that runs via them, and when the air passes more than them they remove heat from the air. Also the extra moisture in the air condenses on them much the same way the dampness from a hot shower condenses on the fairly awesome bathroom mirror, so the coils decrease the humidity as well as the temperature of the air in your home.

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