An energy transfer system for transferring energy between the earth and a facility comprising a well bore at least partially filled with groundwater, a center pipe having a top end and a bottom end disposed in the well bore and having a plurality of apertures for allowing the ingress and egress of groundwater, a pump disposed within the center pipe for facilitating a flow of groundwater through the apertures, and a closed source loop disposed in the well bore, the source loop including at least one source loop pipe extending adjacent the center pipe in said well bore and containing a working fluid for absorbing or transmitting thermal energy.