本文基于热泵使用寿命（更换时的年龄）的研究。该研究的目的是调查1964年至1974年间安装了热泵的已知热泵所有者，收集经验数据，以回答一系列关于已知热泵或后续热泵使用寿命的问题，并确定影响更换决策的因素。主要调查结果包括:96%到98%的受访者仍然使用热泵； 大部分原机组仍在运行；在阿拉巴马州，置换的平均年龄约为20岁。单位:I-PCITION:研讨会，ASHRAE交易，1985年，第91卷，pt。你好，檀香山2B

This paper is based on a study of heat pump service life (age at replacement). The objective of the study was to survey known heat pump owners who had installed heat pumps between 1964 and 1974, gather empirical data that would provide responses to a series of questions concerning the service life of the known heat pump or, if appropriate, the successor, and determine the factors that influence the replacement decision. The major findings include the following :Between 96% and 98% of the respondents surveyed still had heat pumps;A large percentage of the original units are still in operation;The median age of replacement is approximately 20 years in Alabama.Units: I-P