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ANSI/ASHRAE/IES Standard 100-2018

Energy Efficiency in Existing Buildings

This standard applies to existing buildings, portions of buildings, and building complexes, including the envelope and all systems in the building. This standard excludes industrial and agricultural processes in buildings for which the energy targets do not include those processes.

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American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. [ASHRAE]


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As the voice of the U.S. standards and conformity assessment system, the American National Standards Institute (ANSI) empowers its members and constituents to strengthen the U.S. marketplace position in the global economy while helping to assure the safety and health of consumers and the protection of the environment.

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