Lennox Air Conditioners Search Search Search Lennox Series Lennox Series Dave Lennox Signature® Collection (2)Elite® Series (4)Merit® Series (3) Sort by SEER Sort by SEER Sort by SEERHigh to LowLow to High SEER Value SEER Value Reset ENERGY STAR® ENERGY STAR® Yes (7)No (2) SL28XCVUp to 28 SEERUp to 25.8 SEER2 XC21Up to 21 SEERUp to 19.2 SEER2 XC20Up to 22 SEERUp to 20.2 SEER2 EL18XCVUp to 18 SEER EL16XC1Up to 17 SEERUp to 16.2 SEER2 XC13Up to 16 SEER 16ACXUp to 18 SEER ML14XC1Up to 17 SEERUp to 13.4 SEER2 13ACXUp to 13 SEER