[schamp]

Spray foam, 2x6 walls and geothermal heat and a/c. I got talked out of 2x6 walls and have regretted it ever since. Spray foam over the ceilings and under the roof decking. You may have to wait until after your CO to foam under the roof decking cause they will try and tax you on heated and cooled, insulated space. The one thing that is guaranteed to go up is your utility cost. My geothermal a/c units heat the water in the heaters. Maybe I should say pre heat. But in the summer I can turn the breakers off on the water heaters. I build mine with 2 foot over hangs on the eves. Wish it was three.