2016 Trane high efficiency furnace running in great condition. 20x25x1 air filter is new today. Three more air dilters are left in the box. Clean flame sensor and check ignitor. Visual inspection of burners. Flush condensation trap and drain lines. Run test unit in heating mode. Delta t of 49F with supply temp of 118F, Delta t spec of 35-65F. Humidifier pad in good condition. Damper opened and humidifier test ran during heating test. All systems are operating properly, efficiently and ready for Winter