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Department of Energy Recognizes ASHRAE 90.1-2010 as New National Energy Standard

In a bold move, on October 19, 2011.. By October 18, 2013, all states in the United States must put in place a commercial building energy code at least as stringent as the ASHRAE/IES 90.1-2010 energy standard, according to an October 19, 2011 Department of Energy (DOE) ruling. This means the 2007 standard is effectively being leapfrogged as the national energy standard.