CLEAN AND CHECK 10 YR HEATING UNIT. CLEAN AND CHECK BURNERS AND BURNER OPERATION, LUBRICATE ALL NECESSARY MOVING PARTS AND ADJUST BLOWER COMPONENTS. CHECK HEAT HIGH LIMIT CONTROL. CHECK THERMOSTAT, HUMIDIFIER, AIR FILTER, AIRFLOW, ENERGY CONSUMPTION, COMPRESSOR DELAY SAFETY CONTROL. AND ALL ELECTRICAL CONNECTIONS. EVERYTHING IS RUNNING GREAT.