Furnace tune-up and safety inspection. Cleaned and served the furnace. Cleaned all sensors. Tested all mechanical components. Tested gas valve voltage and inlet/outlet pressures and performed heat rise tests. Changed the furnace filter that the customer provided. Cleaned the exhaust pipe. The system is clean, heating, and operating properly at this time. Customer renewed maintenance plan. One visit is being used today, and they will have the spring/ac visit of 2026 prepaid remaining on the plan. Performed free plumbing inspections.