Standard 90.1-2007 Established as National Reference Standard for Federal, Commercial Buildings

Commercial and high-rise residential and federal buildings must now meet requirements in ASHRAE/IESNA’s 2007 energy efficiency standard, under recent rulings issued by the United States Department of Energy (DOE) that finds the standard saves more energy than the 2004 version.

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[source: http://www.buildings.com/article-details/articleid/12775/title/standard-901-2007-established-as-national-reference-standard-for-federal–commercial-buildings.aspx]