The DOE liked these improvements, endorsed them, and notified the states that they should adopt Standard 90.1-2010 (or a code that DOE sees as equivalent) by October 2013. Energy-savings calculations compared to ASHRAE 90.1-2004 were improved by approximately 25%, including plug loads, and approximately 31% for lighting alone. Both the 20 versions of ASHRAE 90.1 have changes, including tables, definitions, and sections, with the 2013 version being the most stringent. ASHRAE Standard 90.1 requires lighting designers to include power allowances, daylighting controls, functional testing, and submittals in their lighting designs.
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