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As more and more home builders showcase energy efficient construction, Harvard is tackling a much tougher problem. The University’s “Center for Green Buildings and Cities” is looking for ways to retrofit older homes for zero energy consumption at a new living lab along the edge of its campus. The lab is a pre-1940’s home in Cambridge, that doubles as the Center’s headquarters, and is now so energy efficient, it doesn’t need an HVAC system.   www.NewsForInvestors.com