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

Measure Description

This measure will evaluate the 2019 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 effort will include the following submeasures: 

AWHP and Three Function Heat Pump Modeling 

Improving the performance characterization for both air-to-water heat pumps and three function heat pumps (heat pumps which provide water heating as well as space conditioning) within the 2019 Residential Alternative Calculation Method. The current plan is to differentiate performance between fixed speed and variable speed AWHP equipment. 

Hydronic Radiant Delivery 

Incorporate radiant ceiling panels as an alternative recognized hydronic distribution system option.

Relevant Documents

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

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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.

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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.

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