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Home Power Magazine: Solar | Wind | Water | Design | Build for lots of great information and insight on energy-efficient design. I'm currently consulting with a housewright on my next home: Larsen Truss frame with 12" walls (R-42 with blown-in cellulose insulation), R-60 ceiling, passive solar slab (insulated from the ground and foundation perimeter), and 2 kwh of PV's and a solar DHW heating system.