实验室测试和现场测试表明，热泵热水器（HPWH）使用的电能输入约为电阻式打水器的一半。然而，由于HPWH从其环境中的空气中提取能量，因此产生了一个问题，即这种能量提取将如何影响房屋供暖、通风，和空调（HVAQ系统，如果HPWH位于一个有条件的家庭空间中。第二个问题涉及将HPWH放置在车库或地下室等无条件空间中所获得的节约。橡树岭国家实验室对这些影响进行了计算机研究。由于地理位置、房屋建筑、HVAC系统的类型和效率以及热水使用都会影响在研究中，这些参数中的一些是固定的，一些是允许变化的。 引文:德克萨斯州休斯顿ASHRAE学报第88卷第1部分研讨会

Laboratory testing and field testing have shown that a heat pump water heater (HPWH) uses about half the electrical energy input that an electric resistance water beater does. However, since the HPWH extracts energy from the air in its environment, the question arises as to how this energy extraction would affect the house heating, ventilating, and air-conditioning (HVAQ system if the HPWH were located in a conditioned space of a household. A second question concerns the savings obtained by locating the HPWH in an unconditioned space such as a garage or basement.A computer study of these effects was carried out at the Oak Ridge National Laboratory. Since geography, house construction, type and efficiency of HVAC system, and hot water usage will all affect the effective performance, some of these parameters were fixed and some were allowed to vary in the study.