21 SEER: 4 Ton Tri-Zone Ceiling Cassette AC, Heat Pump: The 54000 BTU* Tri Zone INVERTER mini split can cool or heat THREE separate zones (18000 + 18000 + 18000 BTU) for a total coverage area of over 2100 ft² (750 + 750 + 750 ft² areas). The air handlers are discreetly recessed into a ceiling panel - only grille is visible. Inverter technology provides benefits of low operation temps, rapid cooling / heating, as well as maximum efficiency. R410A Pre-charged .