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