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Ashrae 90.1-199911/27/2023 ![]() Four out of five states, in fact, have adopted ASHRAE 90.1-1999/2001/2004 or IECC 2001/2003/2006, either verbatim or amended, as their energy code.ĪSHRAE 90.1, Energy-Efficient Design of New Buildings Except Low-Rise Residential Buildings became the reference national energy standard in 2002. Most energy codes in the United States are based on ASHRAE 90.1 or IECC. State and local governments adopt commercial energy codes to establish minimum energy efficiency standards for the design and construction of buildings.
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