Furnace maintenance and safety inspection. Cleaned and serviced both furnaces. Tested all mechanical components on the basement furnace (96%), cleaned out the condensation trap, and all hoses. Cleaned all pressure switch hoses. Tested gas valve voltage and inlet/outlet pressures. Changed the furnace filter that the customer provided. The system is clean, heating, and operating properly at this time. The second furnace was tested, and all mechanical components. Cleaned all sensors. Changed the furnace filter that the customer provided. Tested gas valve voltage and pressures. The system is clean, heating, and operating properly at this time. Performed free plumbing inspections.