Preventative maintenence inspection on two high efficiency gas furnaces running in good condition. Replace both air filters. Humidifier pads are in decent condition. Recommend replacing before next heating season. Clean flame sensors and checked ignitors. Visual inspection of burners. Flush condensation traps and drain lines. Run test systems in heating mode. Both systems are operating properly and within specs for temperature rise, and blower and inducer motor amp draw. Pvc flue vents in good condition and no sign of leaks. 0PPM CO detected during testing. Tested humidifier operation on both. Furnaces and humidifiers are operating properly, efficiently and ready for Winter.