I plan to use concrete walls, ceilings and floors, with radiant heat, supplied by solar energy cells. The walls will be 12" thick, and very safe and efficient. This technique is a little more expensive to build than using lumber, but the energy savings offset the initial outlay for construction in a few years. Plus, we use far less trees, and obtain a better product that will last for generations.
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I will retire back to Indiana in a couple of years and will build a house out in Greene County. I am thinking about using similar construction: poured basement, geothermal heat pump, and possibly ICF for the main floor (or your technique), brick exterior (recycled if I can find them), wrap around porch, metal roof. I am also considering timber frame with SIP.
Doug