ASHRAE guidelines and standards open for comment

The below draft is open for a 30-day public review

• BSR/ASHRAE/IES Addendum o to ANSI/ASHRAE/IES Standard 90.1-2025, Energy Standard for Sites and Buildings Except Low-Rise Residential Buildings (advisory public review). Public review closes Sept. 6. 

  Addendum o shifts the focus from installed heating efficiency to how heating equipment is actually sequenced and operated, which better reflects how many hospitals are currently designing high-performance central plants. Other highlights of the addendum include: 

  • Make hybrid heating systems easier to justify and demonstrate compliance.
  • Recognize operational sequencing of boilers, heat pumps, and water-heating equipment.
  • Potentially reduce first costs by eliminating the need to oversize high-efficiency equipment solely for code compliance.
  • Require new control sequences, documentation, and commissioning attention.
  • Improve alignment between energy modeling and actual hospital plant operation.

The below draft is open for a 45-day public review

• BSR/ASHRAE/IES Addendum b to ANSI/ASHRAE/IES Standard 100, Energy and Emissions Building Performance Standard for Existing Buildings (first public review). Public review closes Aug. 31. 

  Standard 100-2024 includes energy use intensity (EUI) targets for site energy and source energy, and has added green house gas intensity (GHGI) targets. It also changed the basis for calculating site energy use. To simplify the standard, which currently allows a building to comply via site or source EUI targets, the committee decided to move all source EUI targets to an informative appendix. This addendum will have no effect on a building that does not have EUI or GHGI targets. The vast majority of this addendum is the deletion of all references to source energy throughout the existing standard.

Visit the ASHRAE portal to make comments on the above addenda.