The key is that Geothermal heat pumps use electricity to move the heat and the burning of fossil fuels is eliminated. The United States E.P.A. has stated that there is no other technology that has better operating efficiencies or economics than Geothermal HVAC.
While initially a Geothermal HVAC system is more expensive to install than conventional HVAC, Geothermal systems can provide a payback of less than 5 years and in some cases less than 2 years.
The E.P.A. has concluded that Geothermal HVAC causes less environmental harm than any other system available and has the lowest CO2 emissions for minimum greenhouse effect.
Geothermal HVAC offers economical operation, product quality and noise reduction. The warranties for the actual heat pump units are 10 years and the drilling itself is warranteed for 50!
The question is can you afford not to go Geothermal?