What about Geothermal Heat Pump economics?

Geoexchange systems represent a savings to homeowners of 30% to 70% in the heating mode, and 20% to 50% in the cooling mode compared to conventional systems. Well-designed residential systems exhibit positive cash flows from the first month: the incremental cost of amortizing the geoexchange system is less than the cost of the fuel or electricity not used. Closed loop commercial and institutional systems today can cost less than alternative designs, and larger open loop systems may save hundreds of dollars per ton relative to conventional systems.