An article by William Opalka, Energy Manager Today.

The energy standard for most buildings underwent an overhaul that is significant compared to recent versions and up to 50 percent more demanding than the 2004 revision.

ANSI/ASHRAE/IES Standard 90.1-2013, Energy Standard for Buildings Except Low-Rise Residential Buildings, incorporates 110 addenda. These reflect changes made through the public review process by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE).

The standard was last revised in 2010, and the new version represents a standard 40 to 50 percent more stringent than the 2004 version.

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