About This Book
ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) is a national consensus energy standard establishing minimum efficiency requirements for the design, construction, and operation of commercial buildings, high-rise residential buildings, and their sites. (I-P denotes Inch-Pound units.)
Scope The standard excludes low-rise residential buildings (single-family homes, manufactured homes, and multifamily buildings three stories or fewer). It covers commercial and institutional buildings, high-rise residential buildings, new construction, and new mechanical, lighting, or service water heating systems in existing buildings. Its scope extends beyond the building footprint to address site-level energy factors.
Key Updates in 2022 The 2022 edition incorporates over 80 addenda, superseding the 2019 edition. Major changes include: - On-site renewables: New minimum prescriptive requirements for on-site renewable energy generation - Energy credits: Expanded compliance paths (including Section 11 updates) yielding roughly 4–5% additional savings - Air leakage testing: Mandatory whole-building testing for a broader range of buildings, including those under 25,000 sq. ft. - HVAC & lighting: Updated efficiency metrics (SEER2/HSPF2 for smaller heat pumps, higher IEER for commercial rooftops, and horticultural lighting metrics)
Overall, the edition delivers approximately 14% net energy and cost savings compared to the 2019 baseline.
Legal Status The standard is voluntary until adopted by state or local authorities. It serves as the technical foundation for U.S. commercial energy codes—often paired with the IECC—and underpins programs such as LEED.
Practice Tests Using This Book
This book is required or recommended for 1 licensing exam. Our practice tests include questions based on this material.