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Super-Insulated Retrofit Book (Sun builders series) Paperback – December 1, 1981
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If the book shows its age in any department it is the section about furnaces, but mostly because furnace efficiency has improved a lot over the years. The stuff about furnace size, though, was right on.
Overall, I thought this was a cool book and I found myself flipping through it and trying to understand it all. This is a great book for someone who is looking to save some money on their energy costs, improve an old home, or build a new one.