Performed tune up on system for new customer. She was referenced to us by OG&E. I did a thorough inspection of the entire HVAC System. AC and evaporator coil are from 2005 and the heater is from 1980. Customer already changed filter recently. I checked blower operation, evaporator coil, drain, ductwork and overall condition. Checked thermostat operation, wiring, capacitor, contactor, compressor, fan motor, amps, temperatures and pressures of condenser. Contactor was pitted and needed replacement. Customer didn’t want to replace it at this time. Overall system is still operating properly, but I do strongly recommend the system be replaced soon.