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Single Family Enhanced Air-to-Water Heat Pump Compliance Options

Measure Description

This CASE Report will evaluate the existing residential Alternative Calculation Method modeling approach for air-to-water heat pumps and to utilize recently available field data to better characterize performance and accommodate emerging strategies for these products. Air-to-water heat pumps are currently not a mainstream HVAC technology in the California residential market due to a variety of market factors and a historical reliance on widely available natural gas for space and water heating. All-electric space conditioning is an emerging area of interest as the state is moving towards an increasingly decarbonized future and many energy efficiency advocates are promoting all-electric solutions for the residential market. This CASE Report will include the following four submeasures.

AWHP and Three Function Heat Pump

These two submeasures combined will improved performance characterization for air-to-water heat pumps and three function heat pumps (which provide water heating as well as space conditioning).

Hydronic Radiant Delivery

This submeasure will include radiant ceiling panels as a viable hydronic distribution system.

Off-peak Cooling

This submeasure will incorporate off-peak chilled water storage as a load-shifting measure.

Provide Feedback

Participate in the Utility-Sponsored Stakeholder meeting for this topic on October 10th, 2019! View the event here.

This measure description will be updated as research is developed to support the 2022 code cycle. For questions or suggestions, email Include the measure name in the subject line.


Relevant Documents

Measure proposals, supporting documents, and other outside references will be made public as they become available.


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.