Air conditioner is not cooling below 74?

POSSIBLE CAUSES AND SOLUTION: 1. IF MORE THAN 5 YEARS SERVING YOU COMFORT -- ITS TIME TO RECHARGE FREON GAS. 2. THERMOSTAT IS DEFECTIVE 3. BELOW 23 DEGRESS CELSIUS (74 DEGREE FAHRENHEIT) CANNOT BE ATTAINED IF REGULAR TOTAL COIL CLEANING (QUARTERLY) AND FILTER REPLACEMENT (SEMI-ANNUAL) OR CLEANING (WEEKLY) IS NOT PRACTISED. 4. AFTER THOROUGH CLEANING IF COILS FOR BOTH CONDENSER AND EVAPORATOR SIDE --- USE COIL COMB OR ANY FLAT SHAPED PLASTIC TO ARRANGE COIL IN STRAIGHT AND PARALLEL TO EACH OTHER TO HAVE MAXIMUM AIR EXCHANGE AND FLOW.