An attractive alternative to conventional heating, cooling, and water heating equipment is the ground-source heat pump. The higher initial cost of this equipment must be justified by operating cost savings. Therefore, it is necessary to predict energy use and demand. However, there are no seasonal ratings for this type of equipment. The ratings for ground-source heat pumps calculate performance at a single fluid temperature (32°F) for heating COP and a second for cooling EER (77°F). These ratings reflect temperatures for an assumed location and ground heat exchanger type, and are not ideal indicators of energy use