Ideal-Air Pro-Dual 48,000 BTU 21.5 Seer Multi-Zone Heating & Cooling Outdoor Unit. The Ideal-Air Pro-Dual Outdoor unit can me matched up with multiple indoor head configurations. These systems are designed to function with 1 single outdoor condensing unit with a minimum 2 indoor units up to 5 indoor heads maximum. (See Match up chart online at www.ideal-air.com, this will also be listed on the packaging of the box). 208-230V, 1ph, 60Hz, 35 Amps and 3040 watts. Outdoor ambient cooling operating temperature range -13°F to 122°F, outdoor ambient heating operating temperature range -13°F to 86°F.