Geothermal energy is most easily thought of as renewable heat harvested from the earth. It can originate from inside the earth. However in the case of a Geo exchange system it’s actually harvesting solar energy stored near the earth’s surface in a zone which remains of moderate temperature year round.

This provides a form of free, renewable energy. If you are considering switching to geothermal energy, this video should serve as an interesting introduction to the advantages and practicality that comes with a Geo exchange system.