Just a few years ago, the first North American Passive House Conference was attended by a handful of passionate adherents trading tips around folding tables in Urbana, Illinois. But this year, with a keynote speech by green energy prophet Amory Lovins, and attended by roughly 350 practitioners from across the country, the 2010 conference, held from November 4 to 7 in Portland, Oregon, helped establish Passive House as a viable force in the green building movement.
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