Space-constrained and Small Duct High Velocity Products

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This map shows that space-constrained AC/HP and small duct high velocity products use the National energy efficiency standards throughout the US.

There is only one National energy efficiency standard for these types of products in the US. Under M1, minimum energy efficiency standards remain approximately the same as the pre-2023 standards. 

Space-constrained AC/HP and small duct high-velocity systems are enforced based on the date of manufacture. Therefore, any product compliant with the applicable regulation on its manufacture date can be sold and installed anywhere in the US after January 1, 2023.

For example, a 14.0 SEER split-system heat pump built before January 1, 2023, can still be installed throughout the US. The manufacturer is solely responsible for ensuring compliance with heat pump and specialty AC energy efficiency regulations. 

The table below shows the change in numerical values for space-constrained AC/HP and small duct high-velocity system minimum efficiency standards.