South or southeast orientation in Southwest U.S.?
I will be building a 20×40 rectangular house on a slab on grade with a painted concrete floor. It will have a gable roof and 2′ overhangs all around and minimal windows on all but the south side. It will be located in Arizona, in the slightly cooler part of Climate Zone 2B, where typical winter days range from 28 at night to 55 in the afternoon and summer days range from 60 at night to 100 in the afternoon Is the ideal orientation for the long side of the house to face due south, or should it face somewhat southeast so that it warms faster in the morning sun and catches less sun in the afternoon? If the latter, how would the ideal southeast angle be determined?
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