I was called to a home to perform maintenance on an 18-year-old split system. The system was still working well, but the homeowner wanted to ensure it was in good working order. I inspected the unit and found that the coils were clean and the refrigerant levels were correct. I also checked the electrical connections and found no issues. I performed a thorough cleaning of the unit and replaced the air filter. The homeowner was very pleased with the work and thanked me for my service.