Preventative maintenence inspection on two Carrier high efficiency furnaces. Both air filters in good condition. Basment system humidifier pad in good condition. Clean flame sensors and check ignitors. Visual inspection of burners. Flush condensation traps and drain lines. Run test each system in heating mode. Temperature rise is within specs for both. Blower and inducer motors tested good. Pvc flue vents in good condition and no sign of leaks. 0PPM CO detected during testing. Both systems are operating properly, efficiently and ready for Winter.