"...The California Building Industry Association estimates that 1,500 new solar-powered houses were built last year for about 2% of total construction." A much as 5% of new construction this year is expected to have solar power as a built in feature.""...The SunPower system features 10 panels on a one-story house and 12 panels on a two-story home. It is part of Lennar's Solar Plus package, which also includes a radiant barrier in the attic to reflect heat, increased insulation, more efficient air conditoning and tighter ductwork."
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