Effective January 1, 2023, the Department of Energy (DOE) increased the minimum requirements for Seasonal Energy Efficiency Ratio (SEER) across all U.S. regions. New SEER2 standards are used to measure the energy efficiency of air conditioning units and heat pumps, including split systems such as ductless mini splits.

The minimum requirement for all U.S. regions increased by one (1) number. The new minimum rating for the northern region is 14 SEER. The new minimum rating for the southeastern and southwestern regions is 15 SEER, except for package unit air conditioners which remain at 14 SEER.