Completed furnace, maintenance and inspection. I wiped down the furnace and cleaned flame sensor. I checked amp draws and tested components. I tested airflow and temp splits. Furnace is operating within manufacture specifications. I have no concerns with furnace at this time. Furnace is operational at departure Spoke with customer about surge protection for the whole home or for the HVAC system. They would like to talk it over and think about what they would like to do.