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An air-source heat pump unit is an energy‑efficient heating and cooling system that harnesses the reverse Carnot cycle to extract low‑grade thermal energy from outdoor air and, through the work of a compressor, upgrade it to high‑grade thermal energy. By consuming only a small amount of electricity, it can “transfer” 3 to 6 times its electrical input in the form of heat or cold, enabling dual functionality: in summer, it supplies chilled water to central air‑conditioning terminals for cooling, and in winter, it provides hot water for space heating. It serves as a clean‑energy alternative to conventional coal‑ or gas‑fired boilers and is widely employed in central HVAC systems for office buildings, shopping malls, hotels, hospitals, schools, residential complexes, as well as in industrial temperature‑control applications and agricultural breeding operations.