Definitions of geothermal heat pump on the Web:

• A geothermal heat pump system is a heating and/or an air conditioning system that uses the Earth’s ability to store heat in the ground and water …
  en.wikipedia.org/wiki/Geothermal_heat_pump
• Geothermal systems are simple refrigeration-based pumping systems which move and concentrate heat from the earth and make it usable in your home. …
  www.psnh.com/Residential/ReduceBill/glossary.asp
• A pump that uses the constant temperature of the earth, instead of outside air, in order to heat a building’s air or water supply.
  bloomington.in.gov/documents/viewDocument.php

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