Many of these pages include audio  Passive Annual Heat Storage   Tour the world's first earth-sheltered geodesic dome Passive Annual Heat Storage collects heat all summer and saves it for winter. Thirty years of PAHS, Report   Tour the Geodome under  construction Earth-shelter and Passive Annual Heat Storage assistance, plans, videos,  books Buy plans, videos, and books from the Rocky Mountain Research Center Other PAHS homes, including convection-powered ventilation systems. Slide show

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July 17, 2011