早些时候的一篇论文表明，商用地源热泵系统的服务和维护成本明显低于其他暖通空调系统。本文对这些结果进行了扩展，在原来的25个场地上增加了13栋建筑，并将结果与ASHRAE最新的暖通空调维护成本调查进行了比较。本文提供了38个现场的数据，包括基本成本、内部维护和承包商提供的维护的总（计划内和计划外）维护成本（单位:美分/平方英尺/年）。由于一些新站点的维护成本远远高于行业标准，因此生成的数据不是正态分布的。分析（O'Hara Hines 1998）表明，对数正态分布更适合；因此，对数据进行分析，并将其作为日志显示- 典型的调查最近一年的对数平均年度总维护成本在基础成本和承包商提供维护的基础成本每平方英尺6.07美分到8.37美分之间。单位:I-PCITION:研讨会，ASHRAE交易，第106卷，pt。1.

An earlier paper showed that commercial ground-source heat pump systems have significantly lower service and maintenance costs than alternative HVAC systems. This paper expands on those results by adding 13 more buildings to the original 25 sites and by comparing the results to the latest ASHRAE survey of HVAC maintenance costs. Data from the 38 sites are presented here including total (scheduled and unscheduled) maintenance costs in cents per square foot per year for base cost, in-house, and contractor-provided maintenance. Because some of the new sites had maintenance costs that were much higher than the industry norm, the resulting data are not normally distributed. Analysis (O'Hara Hines 1998) indicated that a log-normal distribution is a better fit; thus, the data are analyzed and presented here as log-normal. The log-mean annual total maintenance costs for the most recent year of the survey ranged from 6.07 cents per square foot to 8.37 cents per square foot for base cost and contractor-provided maintenance, respectively.Units: I-P