Residential Heat Pumps

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National Energy Efficiency Standards for HPs and Specialty ACs

The national energy efficiency standard for residential heat pumps applies uniformly throughout the United States. With the new Appendix M1 standard, the national split-system heat pump minimum efficiency standard has changed from 14.0 SEER to 14.3 SEER2 (15 SEER) and 8.2 HSPF to 7.5 HSPF2 (8.8 HSPF).

Heat pumps are enforced based on their date of manufacture. Therefore, any product compliant with the standards applicable on its date of manufacture can stillbe soldand installed anywhere in the US. For example, a 14 SEER split-system heat pump built before January 1, 2023, can still be sold and installed in the US, as long as the product was compliant with existing standards on the date of its manufacture. The manufacturer is solely responsible for ensuring compliance with heat pump and specialty AC efficiency regulations.

2023 Standards for Heat Pumps

The table below shows the differences between Appendix M heat pump standards and Appendix M1 heat pump standards.

Product Class Pre-2023
M Standards
New 2023 M1 Standards

Enforcement

Split-system Heat Pump
(including Ductless)
14 SEER | 8.2 HSPF 14.3 SEER2 | 7.5 HSPF2
(Equivalent to 15 SEER | 8.8 HSPF)
Units manufactured before January 1, 2023 that were compliant with previous standardsmay be installed after January 1, 2023.Applies nationally.
Single Packaged Heat Pump 14 SEER 13.4 SEER2 | 6.7 HSPF2
(Equivalent to 14 SEER | 8 HSPF)
Units manufactured before January 1, 2023 that were compliant with previous standardsmay be installed after January 1, 2023.Applies nationally.

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