ASHRAE STD 90.2 - Energy-Efficient Design Low-Rise Residential Buildings: 2018 [pdf]

ASHRAE 90.2 – Energy-Efficient Design of Low-Rise Residential Buildings: 2018 Edition

Includes all amendments and changes through Addendum Q, May, 2024

ASHRAE/IES Standard 90.2 establishes minimum whole-building energy performance requirements (design, construction, and and verification) for energy-efficient residential buildings. This 2018 revision of Standard 90.2 seeks to deliver residential building energy performance that is at least 50% more efficient than the energy efficiency defined by the 2006 IECC.

Changes from the 2007 edition include:

• New definitions, and clarifications to existing definitions
• Clarification of which elements of the standard apply to new construction as well as to additions and alterations
• Guidance on the use of international climate data from Standard 169 for users outside of the U.S.
• Clarification to prescriptive envelope performance data tables
• New performance specifications for ground-source heat pumps
• Clarification on minimum lighting efficiency provisions for single-family, large single-family, and multifamily homes
• Clarification on pool heater pilot lights, pump motor efficiency, and roof and gutter de-icing systems
• Clarification on compliance verification authority in locations outside of the U.S.
• Revisions to emphasize key building data and reports necessary for compliance determination
• Clarification for modeling software requirements
• Clarification for lighting modeling requirements
• Clarifications to address multizonal building air-leakage testing procedures
• A new normative appendix that addresses proper installation techniques for critical components of buildings that provide thermal resistance

Standard 90.2-2018