AC performance tuneup times one system. Tenant changes their own filters. Inspect blower, evaporator and ductwork. Verified primary drain is clear and flowing at this time. Check thermostat for proper operations. Check outdoor unit. Refrigerant level is good at this time. System is R22. System is almost 17 years old. Washed condenser coil. Tested capacitor and contactor. System is cooling properly at this time. Recommendation today is to change out this system by next year.