Ideal-Air™ Pro-Dual™ 18,000 BTU Multi-Zone Wall Mount Heating & Cooling Indoor Head. The Ideal-Air™ Pro-Dual™ Indoor Head unit can me matched up with multiple different configuration 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). Maximum cooling area up to 368 sq. ft. 3 speed fan, 34.5 dB sound rating, 208-230V, 60Hz, 1ph, 0.40 Amps and 58 watts. Line set connections 1/4 x 1/2 inch.