Completed furnace, maintenance and inspection. I cleaned flame sensor and wiped down furnace. I tested components and amp draws. I checked temp splits. Furnace is operating within manufacture specifications. I recommended using a less restrictive filter to help the furnace breathe better. Customer wanted some information about the duct cleaning and a humidifier install. I measured out the space and made sure that a humidifier could be installed. We talked about how the day would look with a duct cleaning. Customer would like to speak with spouse about the options before deciding what to do. We activated club membership today. Furnace is operational at departure.