In systems involving heat transfer, a condenser is a device or unit used to compress a gaseous substance into a liquid state through cooling. In so doing, the latent heat is released by the substance and transferred to the surrounding environment. For example, a refrigerator uses a condenser to get rid of heat extracted from the interior of the unit to the outside air. Condensers are typically air cooled or water cooled. A "condensing unit" may refer to the entire refrigeration system including the compressor.
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