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Calapooia Crossing is an energy efficient affordable sub-division in Sutherlin, Oregon consisting of 16 dwelling units divided into five single family homes, four duplexes, and one accessible triplex. A common laundry building and office offered the opportunity for a 3.9 KW photovoltaic array. All units utilize a passive solar design, oriented with a long open façade to the south, and spaced to not shade each other from the low winter sun (illustrated in the computer generated sun study below). Exposed stained concrete floors with perimeter and under-slab insulation act as thermal mass in the winter, while sun shades block the hot summer sun. Two buildings, one single family house and one duplex, of the 11 that cover the site are demonstration buildings that not only incorporate the above mentioned passive solar design, but also team a solar heated storage tank with an on-demand gas hot water heater for in-slab radiant heating. Calapooia Crossing provides an opportunity for high quality energy efficient living to a wide range of needs in the affordable housing market, from those with disabilities, though standard rentals, all the way to home ownership