WYboy Ranch
Contemporary Patio, San Francisco
Nature's resources, rather than artificial air controls, cool the house during the hotter months of the year. By its orientation toward the northeast, adjacent to the Petaluma River, the home avoids the intense southern and eastern sun. The property's three mature oaks passively shade windows during the heat of summer-in winter, they lose their leaves, allowing passage of the sun's warming rays.
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Featured in 'The Eco-friendly House'
http://www.suttonsuzukiarchitects.com/news_ecofriendly.html?3
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dappled shade in a low-water yard