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Nonresidential HVAC Space Heating

Proposal Description

This CASE Report presents justifications for code changes to HVAC requirements that refine and build on prior code changes to Title 24, Part 6 approved by the CEC. These proposed code changes address the challenges commercial buildings face in electrifying and continue to drive increases in efficiency in the following areas:

  • Limiting hot water supply temperature in hydronic systems to increase current efficiency and prepare for future electrification.
  • Requirements for mechanical heat recovery and thermal energy storage in new construction, yielding large per unit energy savings for the mechanical heat recovery plus thermal energy storage (HR + TES) measure.
  • Refinements to electric resistance heating that were found to be cost effective in most climate zones and small-to-medium building prototypes.

Relevant Documents

CASE Report

Round Two Utility-Sponsored Stakeholder Meeting Materials

Round One Utility-Sponsored Stakeholder Meeting Materials

Provide Feedback

Submit feedback and view the Energy Commission's proceedings and available proposed code language by visiting their 2025 Building Energy Efficiency Standards page.

This measure page will be updated as the 2025 code cycle progresses. For questions or suggestions, email [email protected]. Please include the measure name in the subject line.

Give Us Your Feedback

The Statewide CASE Team values input from all stakeholders engaged in the Title 24, Part 6 code change process. We encourage the open exchange of code change comments and concerns.

  • Use the form above to provide feedback on this measure.