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  2. ASHRAE 90.1 - Wikipedia

    en.wikipedia.org/wiki/ASHRAE_90.1

    Compared to 90.1-2010, 90.1-2013 is expected to save approximately 8.7% in energy cost, 8.5% in source energy and 6.7% in site energy. [ 9 ] Updates to the building envelope section of 90.1-2013 include changes to the prescriptive opaque envelope and fenestration performance requirements in several climate zones and modifications to the ...