在492家大型暖通空调经销商/承包商的全国样本中进行了电话调查，以得出住宅热泵更换年龄和其他相关问题的估计值。为了提供一个相对的视角，我们收集了单元式空调和燃气炉的类似数据。样本选择和访谈旨在产生公正的结果，并为国家层面和三个地理区域（北部、南部和西部）的总结提供适当的数据可靠性。这项调查是在1985年12月4日至213日期间进行的。调查的主要结果是:经销商对更换单一空气的平均年龄估计- 空调机组为12.1年；空调压缩机，8.8年；热泵机组，10.9年；热泵压缩机，8.0年；和煤气炉，16.3年。86%的经销商认为，热泵的可靠性在过去几年中有所提高，但不到50%的经销商认为，现在安装的热泵的使用寿命比过去更长。只有约26%的经销商使用寿命周期成本分析，客户讨论中使用的热泵的平均更换年限估计为11.2年。估计表明，更换压缩机的安装成本占整个新机组成本的40-45%。 引文:研讨会，ASHRAE交易，1987年，第93卷，pt。1，纽约州纽约市

A telephone survey was conducted among a national sample of 492 large HVAC dealer/contractors to elicit estimates of residential heat pump replacement age and other related issues. Similar data for unitary air conditioners and gas furnaces were collected to provide a relative perspective.The sample selection and interviewing were designed to produce unbiased results and to provide appropriate data reliability for summaries at the national level and for three geographic regions (north, south, and west). The survey was conducted between December 4 and December 213, 1985. The key findings of the survey:The dealers’ average estimate of age at replacement for unitary air-conditioning units is 12.1 years; air-conditioner compressors, 8.8 years; heat pump units, 10.9 years; heat pump compressors, 8.0 years; and gas furnaces, 16.3 years.Eighty-six percent of the dealers believe that heat pump reliability has been improved over the past few years, but slightly less than 50% expect the service life of heat pumps being installed today to be materially longer than that of the past.Only about 26% of the dealers use life-cycle cost analysis, and the average replacement age estimates for heat pumps used in customer discussions is 11.2 years. Estimates indicate that the installed cost of replacement compressors is 40-45% of the cost of a total new unit.