Central Air Conditioner by SEER Rating.
SEER stands for seasonal energy efficiency ratio, and the SEER rating of an AC system is particularly relevant if you live in a climate where the temperature changes drastically. SEER is calculated by
determining the cooling output during the winter season divided by its electric input. The higher the rating, the more efficient it’ll be. Since 2006, the U.S. Department of Energy has required new central ACs to have a minimum SEER rating of 13. According to the U.S. Energy Information Administration, this will be increased to 14 in the northern U.S. and 15 in the southern U.S. by 2023.