In heating applications, heat is rejected indoors and absorbed by outdoor air or the ground. This is accomplished by changing the pressures at which heat absorption and rejection occur, and to reverse the flow direction of the working fluid.
Carbon dioxide makes an excellent choice for both heating and cooling, especially if a ground loop is employed. In fact, alternating between one and the other with the seasons helps stabilize ground temperature and maintain high efficiency all year.
Thar Energy has developed systems for ground-source heat pumps that double as air-conditioning systems in the summer. These systems feature unique efficiency boosters that provide the highest coefficient of performance available anywhere -- a complete HVAC solution.