Preventative maintenence inspection on Trane high efficiency furnace. 20x25x4 air filter in good condition. Clean flame sensor and check ignitor. Visual inspection of burners. Flush condensation trap and drain lines. 2" pvc flue in good condition and no sign of leaks. 0PPM CO detected during testing. Run test unit in heating mode. Temperature rise is within specs. Blower and inducer motors tested good. Gas furnace is operating properly. Tested operation of geothermal heating. Ground loop pressure is within spec. Geothermal heating temperature rise is within specs. Did not check refrigerant as there is no issues suspected at this time. System is operating properly, efficiently and ready for Winter.