RheemВ®, RD18AY48AJVCA, Heat Pump, Series: RD18AY, 4 ton Nominal, 48000 Btu/hr Heating, 208/230 V AC, 1 pH, 60 Hz Power Source, 4350 cu-ft/min Flow Rate, 13 EER, 19 SEER, 10 HSPF, Variable Speed Inverter-Driven Compressor, R-454B Refrigerant, 7/8 in Suction Line, 3/8 in Discharge Line, 1/3 hp Motor, 550 rpm, 50 dBA Sound Level, 58 in H x 19.8 in W x 40.4 in L Dimensions