XL15c Dual Fuel Dual FuelUp to 15 SEER2Up to 7.5 HSPF2Up to 81 AFUE XL15c Gas/Electric Gas ElectricUp to 15 SEER2Up to 81 AFUE XL15c Heat Pump Heat PumpUp to 15 SEER2Up to 7.5 HSPF2 XR13.4c Heat Pump Heat PumpUp to 13.4 SEER2Up to 7 HSPF2 XR13.4h Heat Pump Heat PumpUp to 13.4 SEER2Up to 6.7 HSPF2 XR13.4c Gas/Electric Gas ElectricUp to 13.4 SEER2Up to 81 AFUE XR13.4c Air Conditioner Air ConditionerUp to 13.4 SEER2