Celebrating 125 Years

Newly Revised Standard 90.2 Includes New Performance Specifications, More

Newly Revised Standard 90.2 Includes New Performance
Specifications, More

From eSociety, December 2018

The newest version of ANSI/ASHRAE/IES Standard 90.2-2018, Energy-Efficient Design of Low-Rise Residential Buildings, seeks to deliver residential building energy performance that is at least 50% more efficient than the energy efficiency defined by the 2006 IECC.


ASHRAE/IES Standard 90.2 establishes minimum whole-building energy performance requirements (design, construction and verification) for energy-efficient residential buildings.

The standard was last updated in 2007.

Updates to the 2018 edition include:

  • New definitions and clarifications to existing definitions

  • Clarification of which elements of the standard apply to new construction, 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 multi-family 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 multi-zonal building air-leakage testing procedures

  • A new normative appendix that addresses proper installation techniques for critical components of buildings that provide thermal resistance.