An 18000-BTU two-zone pairing that gives one room a 9000-BTU indoor unit and another a 12000-BTU unit, because two rooms of unequal size should never be asked to share a single compromise. The 9K suits spaces to 450 sq ft, the 12K to 750 sq ft, and the gap between them is visible in the specification: 326 CFM and 55.8 pints of daily moisture removal from the smaller against 500 CFM and 81.2 pints from the larger, with indoor sound at 30 dB either way. The wall cabinets differ as well, 32.28-in wide on the 9K against 36.22-in on the 12K, at 20.7 lbs and 24.3 lbs, which matters when wall space is being measured room by room before anything is mounted. Where this system genuinely separates itself is the charge: R454B, a newer refrigerant carrying a lower environmental burden, working with an inverter compressor to reach 24 SEER2 and HSPF2 10.5. Those two figures sit at the top of this capacity class and are what earn the system its Energy Star certification. Chassis electrical heating keeps output honest once the weather turns. The 92.6-lb outdoor unit takes 208-230V at 60Hz and the handset answers from as far as 39.5 ft away. Seven modes and eight fan speeds, a sleep mode with screen off, a washable filter and a child lock cover ordinary daily use.