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My brother went geothermal using an overflow of well water, about 5 years ago and still would recomend it, heat and a/c. As far as your house goes, r-40 in ceilings and r-20 walls should be enough. I would stress care in sealing the vapour barrier. Have you checked out how they build r 2000 homes. I started building these in the mid 80's and in my opinion this is the only way to go. a good quality air exchanger makes a huge difference too.
Since we'll be using SIPs (Structural Insulated Panel) for the outer shell, a high-volume exchanger is standard with them. The house is very air-tight with this construction/assembly method. Thanks for all the replies... and keep 'em coming!