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ASHRAE has released an updated version of the ANSI/ASHRAE/IES Standard 90.2-2018, Energy-Efficient Design of Low-Rise Residential Buildings. The standard establishes a minimum whole-building energy performance requirement for ‘energy efficient’residential buildings. According to Plumbing & HVAC magazine, “The new standard outlines cost-effective residential building energy performance measures that are at least 50% more efficient than the older standard created in 2006.”

The last standard was last published in 2007. Changes to the new 2018 standard include:

  • Clarification on compliance verification authority in locations outside of the U.S.
  • Guidance on the use of international climate data from Standard 169 for users outside of the U.S.
  • Clarification of which elements of the standard apply to new construction, additions and alterations
  • New definitions and clarifications to existing definitions
  • Clarification to prescriptive envelope performance data tables
  • New performance specifications for ground-source heat pumps
  • Revisions to emphasize key building data and reports necessary for compliance determination
  • 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 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.

The full text of the new standard can be accessed here.