MAINTENANCE TUNE-UP FOR 4 YR A/C AND 17 YR HT. CHECK AIR FILTER, AIRFLOW, THERMOSTAT, FREON LEVELS, DRAINAGE, ENERGY CONSUMPTION, COMPRESSOR DELAY SAFETY CONTROLS, AND ALL ELECTRICAL CONNECTIONS. CLEAN AND CHECK CONDENSER COIL. CHECK CONDENSER COIL. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. EVERYTHING IS RUNNING GREAT.