The O'Neill Development Corporation and Peabody ArchItects are building the area's first Passive House in Bethesda, Md. Although it looks like a normal house from the outside, it is completely energy efficient and designed to save an average of 90 percent of the cooling and heating energy of a standard home. Some of the features that help are 8-inch-thick walls, triple-glazed windows, and extra insulation and sealing. (Barbara L. Salisbury/The Washington Times)
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