Equinox Passive House has wall built on a tilt (Slideshow)

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credit: Ignatov Architects

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Really, it should be called the Solstice House, because that's what is determining the angle of the glass: it is parallel to the angle of the sun at noon on the day of the solsctice, June 21. No direct sun penetrates at all on noon of that day. Since the amount of light penetrating the glass is proportional to the angle of incidence, it is going to admit less light than vertical glass would all summer long. Andrew Michler at Evolo, an expert on passive design as well as a writer, calls it "a singularly critical design element."