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Is ASHRAE/IESNA 90.1 a voluntary or a mandatory building energy standard?

April 26, 2017ASHRAE building energy iesna mandatory standard Voluntary

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Is ASHRAE/IESNA 90.1 a voluntary or a mandatory building energy standard?

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As a standard, ASHRAE/IESNA 90.1 is voluntary and applicable to new construction, additions, or major renovations. However, the federal government required states to adopt a mandatory building energy code by 2004.