FIRST HEATER TUNEUP UNDER CC. 16x25x pltd filter. did duct cleaning 6/19 prior System Generated Tuneup - 1 Year Comfort Club / Extended Warranty (per system, per year) - Split bk WHILE ONSITE SET UP SPRING TUNE UP MAY. SUGGEST DUCT CLEANING & OR DRYER VENT CLEANING. CAN YOU DO ANYTHING BETTER TO IMPROVE SYSTEM & WHOLE HOUSE???-TK