ASHRAE and the Illuminating Engineering Society (IES) are revising ANSI/ASHRAE/IESNA Standard 100-2006, Energy Conservation in Existing Buildings, to provide greater guidance and a more comprehensive approach to the retrofit of existing buildings for increased energy efficiency.
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[source: http://www.buildings.com/ArticleDetails/tabid/3334/ArticleID/11931/Default.aspx]
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