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The seasonal energy efficiency ratio (SEER) is the ratio of the total heat removed from the conditioned space during the annual cooling season divided by the total electrical energy consumed by the air conditioner during the same season. So, the higher the SEER rating, the less electrical energy your air conditioner uses to cool your home.
https://amplusac.com/amplus-blog/seasonal-energy-efficiency-ratio-seer-updated-laws-and-more