Gold 15 Hybrid HybridUp to 15 SEER2Up to 7.45 HSPF2Up to 81 AFUE Gold 15 Heat Pump Heat PumpUp to 15 SEER2Up to 7.5 HSPF2 Gold 15 Gas/Electric Gas ElectricUp to 15 SEER2Up to 81 AFUE Silver 13.4 Heat Pump Heat PumpUp to 13.4 SEER2Up to 7 HSPF2 Silver 13.4 Over/Under Heat Pump Heat PumpUp to 13.4 SEER2Up to 6.7 HSPF2 Silver 13.4 Ultra-Low NOx Gas/Electric Gas ElectricUp to 13.4 SEER2Up to 8 HSPF2Up to 81 AFUE Silver 13.4 Gas/Electric Gas ElectricUp to 13.4 SEER2Up to 81 AFUE Silver 13.4 Packaged Air Conditioner Air ConditionerUp to 13.4 SEER2