ANSI/ASHRAE/IES Standard 90.1-2022 Energy Standard for Sites and Buildings Except Low-Rise Residential Buildings (I-P Edition)

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Standard 90.1 has been a benchmark for commercial building energy codes in the United States, and a key basis for codes and standards around the world, for almost half a century. This standard provides the minimum requirements for energy-efficient design of most sites and buildings, except low-rise residential buildings. It offers, in detail, the minimum energy efficiency requirements for design and construction of new sites and buildings and their systems, new portions of buildings and their systems, and new systems and equipment in existing buildings, as well as criteria for determining compliance with these requirements. It is an indispensable reference for engineers and other professionals involved in design of buildings, sites, and building systems.


The 2022 edition of Standard 90.1 incorporates over 80 addenda to the 2019 edition. Major additions appearing for the first time in a minimum-efficiency U.S. model energy standard or code at the national level include:

  • A minimum prescriptive requirement for on-site renewable energy
  • An optional Mechanical System Performance Path allowing HVAC system efficiency tradeoffs based on the new total system performance ratio (TSPR) metric
  • New requirements to address the impacts of thermal bridging

Other highlights include:

  • An expanded scope to include sites as well as buildings
  • New energy credit requirements for a customized approach to improving energy efficiency
  • New informative guidance for using carbon emissions, site energy, or source energy as alternative performance metrics to the current energy cost metric
  • Significant efficiency increases in IEER for commercial rooftops and a new SEER2/HSPF2 metric for <65K sized air-cooled heat pumps

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