3.5 Ton Single Stage Convertible Natural Gas/Electric Packaged Unit, Volts: 208-230, Hertz: 60, Phase: 1, Refrigerant: R410A, Factory Charge: 4 lbs 7 oz, EER2: 10.6, Department of Energy Guide SEER2 (Range): 13.4, CFM: 1388, BTU Input: 90,000, BTU Output: 72,000, Cooling BTU: 40,000, Heating BTU: 90,000, Overall Dims: 46-64/79''H X 35-3/50''W X 50-20/29''D, Weight: 474 lbs