A new simplified method for lighting (new Section 9.2) was added. According to ASHRAE, the model is more representative of real-world conditions with the inclusion of updated IES recommendations. Lighting: Lighting power allowances for the Space-by-Space Method and the Building Area Method were modified.Changes to the vestibule section refined the exceptions and added a new option and associated criteria for using air curtains. The air leakage section was revised to clarify compliance. Minimum criteria for SHGC and U-factor were upgraded across all climate zones. Building Envelope: For vertical fenestration, the categories of “nonmetal framed” and “metal framed” products were combined.Section 4.2.5, “Verification, Testing, and Commissioning,” was expanded and requirements were outlined for commissioning in accordance with ASHRAE/IES Standard 202. Administration and Enforcement: Commissioning requirements were added to the standard for the first time. ![]() ASHRAE has released an expanded and revised version of the ANSI/ASHRAE/IES Standard 90.1-2019, Energy Efficiency Standard for Buildings Except Low-Rise Residential Buildings, which includes more than 100 changes, including some pertaining to building facades and energy-saving measures.
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