Lennox Air Conditioners Search Search Search Sort by SEER Sort by SEER Sort by SEERHigh to LowLow to High SEER Value SEER Value Reset ENERGY STAR® ENERGY STAR® Yes (5) Lennox Series Lennox Series Dave Lennox Signature® Collection (2)Elite® Series (3) SL28XCVUp to 28 SEERUp to 25.8 SEER2 EL18XCVUp to 18 SEER EL23XCVUp to 23 SEERUp to 22.4 SEER2 EL17XC1Up to 18.6 SEERUp to 17.4 SEER2 ML18XC2Up to 18 SEERUp to 17.8 SEER2 ML17XC1Up to 17 SEERUp to 16.2 SEER2