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The (New) Energy Frontier

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Passive house gets active, and affordable net-zero housing is on its way

By Justin Klugh

Before there were trains, cranes and Comcast towers, the city of Philadelphia was a church, a chapel, a great hall and, finally, homes—the purpose of which was to put some form of insulation between the elements and the Quakers and others settling here. Brick walls held up 500 houses in what one Swedish pastor called “a very pretty town” between the Schuylkill and the Delaware.

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