21 SEER: Quad-Zone Ductless Mini Split AC - Heat Pump: With a 51000 BTU total Cooling / HEATING Capacity, this Quad Zone INVERTER mini split air conditioner can cool 4 separate zones (9000 + 9000 + 9000 + 24000) for a total coverage area of 2050 ft² (350 ft² + 350 ft² + 350 ft² + 1000 ft² areas). 21 SEER cooupled with Advanced Inverter technology provides the benefits of low operation temps, rapid cooling / heating as well as maximum energy efficiency.