I am building a new house apprx 3500 sq/ft. radiant hot water in basement and first floor. was planning on wood/coal/ back up oil. now with the 30% tax credit on geothermals?? they have me interested. We have not put drywall up so it still is a good time to run duct work for ac and all. i live in pa. so it does get pretty cold so i am looking at multiple wellsi also thought about having a wood/coal as my back up for those real cold times?? any thoughts would be greatly appreciated??