For a variety of reasons, including climate, federal goverment rules treat some states differently for split-system SEER rules.
Starting in 2015, split-system A/C units installed in Alabama, Arkansas, Delaware, Florida, Georgia, Hawaii, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia or the District of Columbia must have a SEER of at least 14.
Split-system A/C units installed in 2015 or later in Arizona, California, Nevada or New Mexico must have a SEER of at least 14 and an EER of at least 11 (for package systems), 11.7 (for split-system units rated at 45,000 BTU/hour or greater) or 12.2 (for split-system units rated less than 45,000 BTU/hour.)
Do you have an HVAC or A/C system with a high energy efficiency rating? Tell us how it's worked out for you in the comments below.
Editor's note: This is an updated version of an article that was originally posted on June 18, 2013.