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Residential Quality HVAC

Residential HVAC

Codes and Standards Enhancement (CASE) Report

The Statewide CASE Team is requesting feedback on the 2019 Title 24, Part 6 Draft CASE Reports. The CASE Report presents pertinent information that supports the code change proposal. Please email feedback to You may also submit written comments to the Energy Commission. See the agenda for Energy Commission pre-rulemaking workshop (available here) for instructions on how to submit comments to the Energy Commission’s docket.

Draft CASE Report: Residential Quality HVAC

Measure Description

The proposed measures will:

  • Align with new 2019 federal furnace fan standards by reducing the required maximum furnace and air handler fan efficacy from 0.58 watts per cubic feet per minute (W/cfm) to 0.45 W/cfm.
  • Ensure the persistence of energy savings from air conditioning systems by adding a compliance option credit for fault detection and diagnosis (FDD) devices.
  • Provide an alternate method to refrigerant charge verification using an improved temperature split method that can identify multiple system faults while reducing verification time.

This code change proposal includes one measure that affects mandatory requirements, one compliance option, and one alternative verification method. The measures affect single family and multifamily building types, including new construction and alterations, and apply to all climate zones.

Request for Feedback

The Statewide Utility Team encourages participation in the CASE Report development process through the submission of data—both primary sources and references to existing data. We are requesting data on areas such as energy savings, costs, market impacts, industry practices, barriers to code compliance, etc. from stakeholders. The data will inform the energy savings estimates, cost-effectiveness analysis, compliance and enforcement, and market impacts that will be presented in CASE Reports.

Do you have feedback or data to share? Send us an email at

California Statewide Utility Codes and Standards Program

This program is funded by California utility customers and administered by Pacific Gas and Electric Company, Southern California Edison, San Diego Gas and Electric Company, Southern California Gas Company, Sacramento Municipal District, and Los Angeles Department of Water and Power in preparation for the California Energy Commission’s Codes and Standards Buildings Advocacy.