The Ideal-Air? Pro-Dual? Indoor Head unit can be matched up with multiple different configurations with 1 single outdoor condensing unit. (See Match up chart online at www.ideal-air.com; this will also be listed on the packaging of the box). 208?230 V, 60 Hz, 1 ph, 3 speed fan, 37 dB sound rating, 15 Amps and 46 W. Line set connections 1/4 in x 3/8 in.