Heat-pump meaning

A device that warms or cools a building by transferring heat from a relatively low-temperature reservoir to one at a higher temperature.
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A device for cooling or warming an enclosed space by removing heat from interior air and transferring it out, or by absorbing heat from outdoor air, or from a hot-water source, and transferring it in.
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A device that transfers heat from something at a lower temperature to something at a higher temperature by doing work.
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