According to the requirements of cooling, heating and hot-water for villa project in Zhengzhou, the advantages and disadvantages of the two kinds of air-conditioning system are compared, those are household air-conditioning unit plus heat-pump water heater, and multifunction ground source heat pump unit. And its energy-saving is analyzed.%结合郑州某别墅工程对供冷、供暖、热水的需求，对比了两种不同空调系统：户式空调机组+热泵热水器，和多功能地源热泵机组性能的优劣；并进行了节能性分析。
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