Upon my arrival in Elgin I did AC Tune-up. I performed a 6 month checkup on 1 straight cool furnace system. Flushed and treated the water removal system, washed the condenser coil with water, cleaned and treated the electrical cabinet with electrical insecticide, the verified the systems performance and safety. I found that exhaust removal system is over amping and the refrigerant pressure control is not metering properly causing high superheat. I spoke with the customer about my concerns and presented repair options. Given the systems age I advise against repairs and recommend having the equipment upgraded. This is something they will have to think about and will give us a call when they are ready to move forward with the consult. They are going to currently continue running the system as it is.