How homebuilder Sustainable 9 built a green sales machine (photos) – Minneapolis / St. Paul Business Journal

How homebuilder Sustainable 9 built a green sales machine (photos)
Minneapolis / St. Paul Business Journal
To make their homes so sustainable the brothers use spray foam and rigid foam wall insulation; construction materials designed to stop heat from escaping the home; and high-efficiency appliances, such as furnaces, central air units and water heaters.