From New Construction to Existing Retrofits, Exceed your Efficiency Goals with Standard 90.1-2019 For more than 40 years, Standard 90.1 has codified groundbreaking efficiency requirements for design, construction, operation and maintenance of commercial buildings. Updating the benchmark document required years of research and thousands of hours of work from Society leaders and industry experts. Standard 90.1-2019 incorporates over 100 addenda to the 2016 edition and includes improved energy saving measures throughout. ANSI/ASHRAE/IES Standard 90.1-2019 - Energy Standard for Buildings Except Low-Rise Residential Buildings Available in I-P and SI editions ashrae.org/standard901http://www.ashrae.org/standard901