I am really interested in learning all I need to know about geothermal HVAC..So that i can make an educated choice..Is
this the best system for me? If it is time forme to replace my current furnice/ac is this when I should consider geothermal as a replacement..I want to be able to do a cost study..will it pay for itself in 5,10,?? years? changes to duct work..a good book? to read..web site..?