CLEAN AND CHECK FOR 9YR HEATING SYSTEM. CHECK THERMOSTAT, AIR FILTER, FAN CONTROL, ENERGY CONSUMPTION, HUMIDIFIER, AIRFLOW, HEAT EXCHANGER, HIGH LIMIT CONTROL AND ALL ELECTRICAL CONNECTIONS. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK GAS PRESSURE AND FOR PROPER VENTING. LUBRICATE ALL NECESSARY MOVING PARTS AND ADJUST BLOWER COMPONENTS.