A dehumidifier is an appliance that reduces the humidity in a room by condensing moisture in the air on to a cold surface. A dehumidifier works in a similar way to an air conditioner, the main difference being that it has both its hot and cold coils in the same box.
Air is drawn in by a fan and moisture from the air condenses on one set of coils much like an air conditioner's evaporator coils. The water drips into a removable bucket or through a hose to a drain. The other coil warms the air, which is blown back into the room.
Although a dehumidifier doesn't cool the air in a room (in fact it heats it slightly), it makes it more comfortable because it decreases the humidity. Most dehumidifiers don't work well under about 65°F because at these temperatures the cooling coil would have to operate below freezing point to condense any moisture.
See also humidity reduction in the home.
Related category• HUMIDITY AND MOISTURE CONTROL
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