WHY IS A GEOTHERMAL HEAT PUMP BETTER?
Water stores tremendous quantities of heat. In nature, few substances have a higher specific heat (one BTU per pound) than does water, making it an ideal heat storage medium for both natural and man-made phenomena.

Air, on the other hand has a very low specific heat (.018 BTU per cubic foot). There is 3472 times more heat stored in a cubic foot of water (62.5 BTU per degree F) as in a cubic foot of air . In other words it would be necessary to move 3472 cubic feet of air through a heat exchanger in an air-to-air heat pump in order to expose that heat exchanger to the same quantity of heat stored in a cubic foot of water (7 1/2 gallons) that is moved thru a geothermal heat pump.