ANSi, or the American National Standards Institute is the national governing standard for home energy ratings. Over a year ago, ANSI approved he HERS (Home Energy rating System) Index as the national standard for governing home energy ratings of new and existing homes. Though HERS was created by RESNET (Residential Energy Services Network), its adoption as the national standard lends credibility to the HERS Index as a national standard for measuring home energy efficiency.
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