- Check filters and, if needed, add new, clean air filters
- Blower Motor – measure amperage and voltage for proper operation
- Gas Pressure – measure and adjust for peak efficiency
- Clean/inspect heat exchanger
- Test air flow duct system for carbon monoxide
- Natural Gas – check for leaks
- Thermostat – test for proper operation, calibrate and level
- Ignition system – test for safe and proper operation
- Lubricate, clean blower motor and wheel
- Safety & Control Circuits – test for proper operation
- Furnace Burners – clean and inspect
- Clean Furnace Exterior