WeatherMaker® Two-Speed with Puron® 38YDB High energy efficiency of 12.0 to 17.5+ SEER Energy cost savings of 16% to 48+% Puron® environmentally sound refrigerant Approved by the EPA-zero ozone depletion The long term choice for affordable service Carrier's most reliable family of products Quiet operation with Carrier's Silencer SystemTM Protected by Carrier's WeatherArmorTM coil guard Superior Comfort Superior Humidity Control Improved Indoor Air Quality Operates on low speed 80% of time Even temperatures throughout home 10-year compressor limited warranty 5-year parts limited warranty * Refer to the combination ratings in the Product Data Sheet for system combinations meeting Energy Star® efficiency standards. Read more about 38YDB.   WeatherMaker® 38YXA High efficiency 12.0 to 15.0 SEER energy costs savings 23% to 33% Up to 8.5 HSPF Puron® environmentally sound refrigerant Approved by the EPA-zero ozone depletion Long term choice for affordable service Carrier's most reliable family of products Quiet operation with Carrier's Silencer SystemTM 10-year compressor limited warranty 5-year parts limited warranty * Refer to the combination ratings in the Product Data Sheet for system combinations meeting Energy Star® efficiency standards. Read more about 38YXA. WeatherMaker® 38YKC Energy efficiency 10.0 SEER, 8.0 HSPF Freon 22® refrigerant Protected by Carrier's WeatherArmorTM coil guard 1-year compressor limited warranty Read more about 38YKC.