A ground-source heat pump has the same components as a standard air-to-air heat pump except that the liquid-to-refrigerant heat exchanger coil is located inside rather than outside | Building America Solution Center
What is a Heat Pump? | How does a Heat Pump work? | Mechanical Boost
Problem 4.11 - A Geothermal Heat-Pump / Air-Conditioner (Updated 6/23/2015)
A Geothermal Heat-Pump - wintertime operation (Updated 12/1/10)
Geothermal Heating Contractor | Geothermal Ground-Source Heat Pump Installation Near You