EDITOR ' S CHOICE
The design of the building incorporates many passive and active sustainable design elements . The South and North facades are widely open to allow for passive solar heating in the winter and natural daylight year-round , while deep overhangs provide shade in the summer .
Highly efficient spray foam insulation in the roof and wall systems offset heat gain in the summer and retains heat in winter . The roof orientation allows the project to integrate generous photovoltaic and hydronic solar panel arrays . Along with a rainwater irrigation system tied into the native landscape , this allows for the house to provide nearly all its energy and water needs . A post-occupancy survey has concluded that the inhabitants rarely use their heating and cooling equipment . The winter temperatures remain comfortable with minimal added heat , and they can passively ventilate the house in the summer months to mostly avoid using their air conditioning system despite the often scorching temperatures . Photovoltaic panels can produce enough electricity for home usage and all electric vehicles .
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