13 POINT MAINTENANCE TUNE-UP FOR A 9YR HEATING SYSTEM. CHECK HUMIDIFIER, THERMOSTAT, AIR FILTER, HIGH LIMIT CONTROL, HEAT EXCHANGER, FAN CONTROL, ENERGY CONSUMPTION, AND ALL ELECTRICAL CONNECTIONS. CHECK BURNERS AND BURNER OPERATION. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. ADJUST BLOWER COMPONENTS, AND LUBRICATE ALL NECESSARY MOVING PARTS.