What a real Phoenix AC tune-up includes
Outdoor coil cleaning. Dust storms and monsoon debris pack the condenser coil, which forces the compressor to run hotter and longer. Coil cleaning is the single highest-value maintenance item in Phoenix.
Electrical and refrigerant checks. Capacitor readings, contactor condition, amp draws, and refrigerant pressures. A weak capacitor caught in April is a cheap part; the same capacitor failing in July is a no-cool emergency call.
Airflow and drain. Filter, blower, evaporator coil condition, static pressure, and the condensate drain line. Clogged drains are a major cause of summer water damage in Valley homes.