Up to 30.5 SEER cooling Up to 10.3 HSPF heating efficiency Capacity sizes ranging from 9 to 18 BTUs Variable-speed compressor Quiet operation Heating capacity is 80% when temperatures fall as low as -22°F Piping lengths up to 82 ft. Base pan heater Heating setback allows for 46° F heating mode 10-year parts limited and 10-year compressor limited warranties to the original purchasing owner upon timely registration1 Connectable unit: 619FB (high wall) 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.