Up to 22 SEER cooling efficiency Up to 10.2 HSPF heating efficiency Capacity sizes ranging from 18 to 56 BTUs Piping lengths range from 66 ft. to 476 ft. depending on unit size Zoning for up to 9 indoor units to a single outdoor unit Indoor units can be ducted or ductless Variable-speed inverter compressor Quiet operation Auto restart after power outage System diagnostics 10-year parts limited and 10-year compressor limited warranties to the original purchasing owner upon timely registration1 Connectable units: 619FB (high wall), 619KB (high wall), 619KC (cassette), 619KD (ducted), 619KF (floor console) Â 1 If properly registered within ninety (90) days after original installation, parts are warranted to the original purchaser for a period of 10 years. Otherwise, parts warranty is 5 years. For other applications a 7-year parts and 7-year compressor limited warranties apply. See warranty certificate for details.