Furnace precision tune up; clean and tune up furnace; clean burners, test ignition components, adjust gas level, test safety circuit, check indoor motors, checked all electrical components, tested indoor air flow, checked heating temperatures, and tested overall furnace operation. Recommended an electronic air cleaner, surge protector and a new pressure/temperature valve for water heater. Also quoted a new water heater. All recommendations were declined at this time. Will follow up with customer in a week.