ANSI/ASHRAE/IES Standard 90.1-2019 Released

New York, NY – ASHRAE recently announced that the revised ANSI/ASHRAE/IES Standard 90.1-2019, Energy Efficiency Standard for Buildings Except Low-Rise Residential Buildings, includes over 100 changes from the 2016 version.

Many of these changes are energy-saving measures. A few of these changes include:

Administration and Enforcement: This standard includes commissioning requirements for the first time. Section 4.2.5, “Verification, Testing, and Commissioning,” has been expanded, and requirements have been outlined for commissioning in accordance with ASHRAE/IES Standard 202.

Lighting: Lighting power allowances for the Space-by-Space Method and the Building Area Method were modified, with the model being more representative of real-world conditions with the inclusion of updated IES recommendations. A new simplified method for lighting (new Section 9.2) was added, lighting control requirements for parking garages were updated, and daylight-responsive requirements and side-lighting requirements were updated as well.

Mechanical: Designers now have the option to use ASHRAE Standard 90.4 instead of ASHRAE/IES Standard 90.1 requirements in computer rooms that have an IT equipment load larger than 10 kW. And for the first time, pump definitions, requirements and efficiency tables are included.