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ASHRAE/IES 90.1-2010 Now The National Energy Standard

On October 18, 2013, all states were required by the U.S. Department of Energy (DOE) to put in place a commercial building energy code at least as stringent as the 2010 version of the ASHRAE/IES 90.1 energy standard. States are expected to adopt 90.1-2010 in whole or in part; adopt the 2012 version of the International Energy Conservation Code (which references 90.1 as an alternate compliance standard); or, like California, develop their own unique code.

Purchase the 2010 standard in the organization’s online bookstore: