Completed furnace maintenance and inspection. I tested airflow and temp splits. I cleaned furnace and flame sensor. I checked all components and amp draws. Furnace is running within manufacture specifications. I have no major concerns today. Most beneficial things for the system would be duct cleaning and Aeroseal. This helps keep the system cleaner and increases efficiency. Surge protection would also be a great add on to the system. The surge protector will protect the system from power outages and power surges.