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Parts HVAC parts

=Introduction= A heat pump is a device used to warm and sometimes also cool buildings by transferring thermal energy from a cooler space to a warmer space using the refrigeration cycle, being the opposite direction in which heat transfer would take place without the application of external power. Common device types include air source heat pumps, ground source heat pumps, water source heat pumps and exhaust air heat pumps. Heat pumps are also often used in district heating systems.

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=References= * [https://en.wikipedia.org/wiki/Heat_pump Wikipedia: Heat pump]