Ideal-Air Pro-Dual 24,000 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 484 sq. ft. 3 speed fan, 35.5 dB sound rating, 208-230V, 60Hz, 1ph, 0.45amps 120watts. Line set connections 3/8 x 5/8 inch.