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== SEER Ratings ==All central ACs were required to have a minimum SEER rating of 10 in 1992 and by 2006 that minimum was raised to 13. In certain regions of the country, like the south and southwest, that minimum standard is raised even farther to 14.In 2023, regulations will require a minimum SEER of 14 for the northern U.S. and 15 for the southern U.S. Year North South & SW 1992 10 10 2006 13 13 2015 13 14 2023 14 15SEER ratings are compiled using standard formulas to help you determine how much you can expect to pay annually in energy costs. This lets you compare air conditioning units and pick the one that best suits your needs.