Performed preventative maintenance on furnace. Changed out filters for customer. Inspected blower assembly, motor, electrical components, burners, flame sensor, igniter, inducer motor and overall condition of equipment. Cleaned flame sensor and components. Checked thermostat operation, wiring, amps, temperatures and gas pressure. Adjusted gas pressure and tested all safeties. Customer stated that the AC seemed a little loud after we installed it. I turned it on today and it wasn’t making much noise. Told customer we would recheck it next service.