i am building a new house in the n.e. and one of the potential hvac guys is proposing geo to run the a/c and a condensing boiler to run the heat and dhw. i wanted the boiler anyway (not a trusting guy) and the hvac guy said i could save some INSTALLATION dollars if i wanted to only have the geo for the a/c. good idea? bad idea? what questions should i ask? thank you all - i learn so much from this forum.