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When I finally own my own home, I want to learn the point of diminishing returns on insulation. I remember doing some math and if I put a foot or two into my parents' attic, their utility bills were supposed to go down, but there was still a long ROI. In the Phoenix area, I think that it would make more sense to put 8" batts on the inside of the roof, if you keep the heat from getting in, you never need to cool it.
I am trying to remember something else... an underground heat pump. In the winter, it brings forty-six-degree air from underground to heat your home, and in the winter, it cools your home.
Dad wanted solar. He had big dreams.
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