Standard level,Old test (pre-2023),Appendix M1 (2023 on),Implied ratio
"Split AC, national (both sizes)",14 SEER,13.4 SEER2,0.957
"Split AC under 45,000 Btu/h, Southeast and Southwest",15 SEER,14.3 SEER2,0.953
"Split AC 45,000 Btu/h and up, Southeast and Southwest",14.5 SEER,13.8 SEER2,0.952
"Split heat pump, cooling",15 SEER,14.3 SEER2,0.953
"Split heat pump, heating",8.8 HSPF,7.5 HSPF2,0.852
"Packaged AC and packaged heat pump, cooling",14 SEER,13.4 SEER2,0.957
"Packaged heat pump, heating",8.0 HSPF,6.7 HSPF2,0.838
"Split AC under 45,000 Btu/h, Southwest",12.2 EER,11.7 EER2,0.959
"Split AC 45,000 Btu/h and up, Southwest",11.7 EER,11.2 EER2,0.957
"Split AC, Southwest, high-SEER units",10.2 EER,9.8 EER2,0.961
"Packaged AC, Southwest",11.0 EER,10.6 EER2,0.964