Open Loop Geothermal Heating, Cooling, Hot Water Systems use drilled GeoExchange supply and return ground water. energy wells. Closed Loop Geothermal systems use drilled Geoexchange energy wells with fluid filled U bend underground piping to transfer this free Solar Powered Geothermal Energy. Standing Column GeoExchange energy wells are a hybrid of open and closed loop using a single well in rock formations to transfer this free energy. So as the saying goes let's " Drill Baby, Drill " for the right reason.