1ST 13 POINT MAINTENANCE TUNE-UP FOR 4,5 YR HEATING UNIT. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK THERMOSTAT, AIRFLOW, AIR FILTER, HEAT HIGH LIMIT LEVEL, ENERGY CONSUMPTION, AND ALL ELECTRICAL CONNECTIONS, ADJUST BLOWER COMPONENTS, AND LUBRICATE ALL NECESSARY MOVING PARTS. EVERYTHING IS RUNNING GREAT.