MAINTENANCE TUNE-UP FOR 4 YR A/C UNIT. CLEAN AND CHECK CONDENSER COIL. CHECK VOLTAGE AND AMPERAGE ON MOTORS. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS. CHECK THERMOSTAT, ENERGY CONSUMPTION, COMPRESSOR DELAY SAFETY CONTROLS, AIRFLOW, AIR FILTER, FREON LEVELS, DRAINAGE, AND ALL ELECTRICAL CONNECTIONS, EVERYTHING IS RUNNING GOOD.