Geoexchange synergies with other renewables.

Passive solar design strongly supports geoexchange heating and cooling efficiency and economics. For larger buildings, solar warming of ventilation air in winter also may have excellent economics for many owners. In the future, efficient buildings with ground-connected heating and cooling systems will meet peak or total loads with user-site photovoltaics, using the electric grid for efficient load management.

Geoexchange synergies with building efficiency.

Geoexchange is a renewable resource. In the heating mode, an efficient geoexchange system will move at least three units of solar energy from the ground for each unit of electricity used by the heat pump and its accessories. In the cooling mode, the same heat exchanger rejects heat to the surrounding ground, which equilibrates with the atmosphere. The energy flux attributable to the heat pumps is orders of magnitude lower than the solar energy received at the ground.