Content Description

 ASHRAE/IES Standard 90.2 establishes whole-building design requirements that enable high levels of energy performance and greenhouse gas emission performance for residential buildings.

Updates to the 2024 edition include:

• New Title, Purpose, and Scope
  • The new title clarifies that Standard 90.2 addresses not only energy efficiency but also energy performance, including emissions and indoor environmental quality (IEQ).
  • The scope is expanded to cover multifamily residential buildings of any height.
• New performance requirements for substantial energy alterations (retrofits)
• Changes to clarify the differences between dwelling units and common areas, and their respective requirements
  • New lighting control requirements for common areas distinct from dwelling units
  • New thermal envelope requirements to specifically address common areas
• Changes to extend energy efficiency requirements that reduce net building energy consumption by approximately half as a stepping stone to net zero energy and net zero carbon emissions design and operation
  • New limits for the maximum Energy Rating Index (ERI) and CO2e Rating Index (CRI) consistent with the most ambitious recommendations of national and international organizations
  • Thresholds for the ERI and CRI (not counting renewable energy) when renewable energy systems are utilized on- or off-site to ensure that the use of renewable energy does not compromise efficiency
  • New provisions for jurisdictions wanting to enforce net zero energy and zero carbon requirements
• Increases in stringency for air leakage requirements
• Expansion of IEQ requirements to create greater alignment with ASHRAE Standard 62.2
  • This revision promotes the harmonization of energy efficiency and IEQ requirements.
• Updates to lighting requirements:
  • Improvements to lighting quality with the use of dim-to-warm and tunable light sources
  • Higher-efficacy requirements for permanent lighting and more detailed requirements for lighting controls in common areas
• New requirements for the provision of charging infrastructure for electric vehicles (EVs)
  • Standard 90.2 compliance now requires every parking space to have EV supply equipment installed or be equipped with the electrical connections of an EV-ready space for future installation.

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About ASHRAE

ASHRAE, founded in 1894, is a building technology society with more than 50,000 members worldwide. The Society and its members focus on building systems, energy efficiency, indoor air quality and sustainability within the industry. Through research, standards writing, publishing and continuing education, ASHRAE shapes tomorrow’s built environment today.

ASHRAE was formed as the American Society of Heating, Refrigerating and Air-Conditioning Engineers by the merger in 1959 of American Society of Heating and Air-Conditioning Engineers (ASHAE) founded in 1894 and The American Society of Refrigerating Engineers (ASRE) founded in 1904.