The basic function of a heat pump is to move heat from one location to another. It sounds simple enough and really, the process is rather simple. The technology involved moves the heat from a low temperature heat source to a higher temperature heat sink. A heat sink is something that absorbs and disperses heat from something else using thermal contact. A heat pump pulls heat from the air or the ground. Thus, you have air-source heat pumps and ground source heat pumps. It should be pointed out that...