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amount of heat annual solar savings Auxiliary heat required backdraft box sill area Btu's Btu/°F sq building load coefficient calculations ceiling chart climate costs DDBASE degree days determine DG Greenhouse 608 DG Mass Wall direct-gain passive solar Drywall Earth Shelter fiberglass figures in column floor heat exchanger heat gain heat load heat loss inch Insulating glazing internal heat living area living space load coefficient BLC load collector ratio Mass Wall 414 Mass Wall 608 materials MMBtu modification curves Monthly performance curves number of degree Osseo Passive Solar Design passive solar homes passive solar system R9 NIGHT INSULATION rebate reduce infiltration Rodale Press solar energy solar gain solar heat Solar House solar savings fraction Soldiers Grove south-facing glass space heating storage mass storage walls thermal efficiency thermal envelope thermal load Thermal storage tion Trombe wall vents Water Wall Wisconsin