3.5 Ton Ultra Low NOx Single Stage Convertible Natural Gas/Electric Packaged Unit, Volts: 208-230, Hertz: 60, Phase: 1, Refrigerant: R410A, Factory Charge: 94 oz, EER: 11, Department of Energy Guide SEER (Range): 14, CFM: 1600, BTU Input: 72,000, BTU Output: 58,400, Cooling BTU: 40,000, Heating BTU: 72,000, Overall Dims: 44-8/9''H X 56-3/23''W X 47-33/50''D, Weight: 522 lbs **Ultra Low NOx Unit is not LP Compatible**