Performed a 28-point precision tune-up on a Carrier central air conditioning system. I inspected electrical components, tested capacitor ratings, verified proper refrigerant charge, cleaned the condenser coil, flushed the condensate drain, and checked static pressure across the ductwork. I also calibrated the thermostat, tightened all electrical connections, lubricated moving parts where applicable, and measured system temperature split to ensure optimal cooling performance and energy efficiency.