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This is a nationwide tour of homes that incorporate passive solar heating and cooling features to various extents. Some homes have PV panels either roof or ground mounted to supply all or part of their electricity needs. In addition, some homes have other energy-efficient features such as super insulation, low HERS ratings, etc. that each homeowner will address through either a video or photo tour. All of the homes were designed by Sun Plans as a custom design, adapted design or stock house design with site-specific modifications.