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By Douglas Hvistendahl (anonymous) | Posted January 19, 2008 at 12:12:57
It is easy and inexpensive to modify a south roof for solar thermal collection. It only adds maybe 20% to the reroofing cost. If in addition, one uses "annualized geo solar" seasonal heat storage, the extra summer heat is put to good use. This can be and is done on discrete houses, but would work better on the type described here. A south facing greenhouse/living space is one good common area.
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