What SEER Ratings are Available?
In 2006, federal regulations were put in place that requires a minimum SEER rating of 13 of new central air conditioners and heat pumps. There are still units at work in homes with a SEER rating as low as 8. Manufacturers today make a product lineup that features a range of SEER ratings. The best selling models offer SEER ratings between 14 SEER and 18 SEER. The most efficient residential condensing units have a SEER rating or well over 20.