Abstract: A geothermal heat exchange system for use in cooperation with a foundation wall of a building. The geothermal heat exchange system includes a heat exchange unit for transferring heat between a building and the earth, a foundation wall that is at least partially buried in the earth, and a ground loop. The heat exchange unit includes an inlet and an outlet for a working fluid. The ground loop includes a loop of piping connected to the inlet and the outlet of the heat exchange unit, and is at least partially imbedded in the foundation wall.