ASHRAE Releases Latest Version of Energy Efficiency Standard 90.1-2022

ASHRAE has released its latest version of its energy efficiency standard, ANSI/ASHRAE/IES Standard 90.1-2022 – Energy Standard for Sites and Buildings Except Low-Rise Residential Buildings. The latest version includes an optional Mechanical System Performance Path allowing HVAC system efficiency tradeoffs based on a new total system performance ratio (TSPR) metric.

The version also includes significant efficiency increases in integrated energy efficiency ratio (IEER) for commercial rooftops and a new seasonal energy efficiency ratio (SEER2)/heating seasonal performance factor (HSPF2) metric for <65K sized air-cooled heat pumps.

These updates demonstrate that Standard 90.1 continues to work with industry stakeholders to drive improvements in the efficiency of HVAC equipment and processes used in buildings.

“The SEER2/HSPF2 metric change aligns performance measurement of products regulated by Standard 90.1 with the very similar and much larger market of single-phase <65K products, regulated as consumer products by the U.S. Department of Energy,” noted ASHRAE standing standard project committee 90.1 chair Don Brundage. “Other than operating on 3 phase power rather than single phase power, they are essentially the same products and should be evaluated using the same performance metric.”

The 2022 edition of Standard 90.1 incorporates over 80 addenda to the 2019 edition. Further major additions involve:

• Required condensing boilers for new construction in order to achieve 90% or greater efficiency for large boilers (1 to 10 million Btu/h). The thermal efficiency requirements for high-capacity gas-fired service water-heating equipment were also increased.
• An expanded scope to include sites as well as buildings
• A minimum prescriptive requirement for on-site renewable energy. This change is representative of a more widely adopted shift to renewable energy.
• New requirements to address the impacts of thermal bridging.

Additional highlights of Standard 90.1-2022 include:

• 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.

To purchase Standard 90.1-2022, visit ashrae.org/bookstore or contact ASHRAE Customer Contact Center at 1-800-527-4723.