Preventative maintenence inspection on two gas furnaces. Both air filters in good condition. Basement humidifier pad needs changed due to calcium buildup up. Keith is getting it himself. Cleaned flame sensors and checked ignitors. Visual inspection of burners. Flush condensation trap on basement system. Test ran each in gas heating mode. Both systems are operating properly and within specifications for temperature rise, blower and inducer motor amp draw, and gas pressure. Exhaust vents are all in good condition and no sign of leaks. 0PPM CO detected during testing. Performed non invasive test on geothermal heating. Refrigerant temperatures are within spec. No unusual codes in the geothermal systems. Systems are operating properly, efficiently and ready for Winter.