Preventative maintenence inspection on 2018 Trane XR95 high efficiency gas furnace running in good condition. 20x25x1 air filter in new condition. Air filter is slightly smaller than what can fit as the current filter is 0.25 inches shorter on each side. This is contributing to the filter being pulled in by blower. Recommend getting air filter with the actual size of 20x25x1. Humidifier pad is in new condition. Clean flame sensor and check ignitor. Visual inspection of burners. Flush condensation trap and drain lines. Test run in heating mode from thermostat. Temperature rise is within specs. Blower and inducer motors tested good. Pvc flue vents in good condition and no sign of leaks. 0PPM CO detected during testing. Humidifier operation tested from thermostat. No issues with furnace or humidifier were found. Systems are operating properly, efficiently and ready for Winter.