CLEAN AND CHECK 4 YR AC UNIT AND 19 YR FURN. CLEAN AND CHECK THERMOSTAT, AIRFLOW, AIR FILTER, FREON LEVELS, DRAINAGE, ENERGY CONSUMPTION, COMPRESSOR DELAY SAFETY CONTROLS, AND ALL ELECTRICAL CONNECTIONS. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS. CLEAN AND CHECK CONDENSER COIL. CHECK VOLTAGE AND AMPERAGE ON MOTORS. EVERYTHING IS WORKING GOOD.