Completed furnace, maintenance and inspection. I checked temp splits and air pressure. I cleaned flame sensor and wiped down furnace. I checked components and amp draws. Furnace is operating within manufacturer specifications. But it was quite a bit of drywall test getting into the system. I talked with customer about the duct cleaning with UV special running through January 31. Customer would like to get through the holidays and talk with spouse before deciding whether to do that or not.