AC maintenance needs depend on usage, environment, and the type of system, but general guidance is as follows: Direct answer

• Most sources recommend scheduling a professional service at least once per year. If the system runs heavily, is older, or operates in a dusty or dirty environment, more frequent service (e.g., biannual) may be beneficial.

Key considerations

• Seasonal timing: Many HVAC pros suggest a spring tune-up to prepare for cooling season, and a fall check-up to prepare for heating season. If you only do one service per year, spring is usually preferred for AC, with a fall check optional for combined heating/AC care.
• What a service typically includes: inspection of electrical connections, refrigerant pressure check, cleaning/coils, thermostat calibration, blower and airflow checks, and filter recommendations. Regular filter changes by the user are important between professional visits.
• Red flags that warrant sooner service: reduced cooling performance, unusual noises, ice forming on coils, high humidity with poor cooling, or sudden increases in energy bills.

Common frequencies by context

• Routine residential: yearly professional service is standard.
• Heavily used or dusty environments: consider biannual visits (spring and fall) to help maintain efficiency and longevity.
• New or high-end systems: manufacturers may specify service intervals in the manual; following those recommendations is best.

If you’d like, share your location, system type (central AC, heat pump, mini- split, etc.), and any recent performance issues. A more tailored schedule (e.g., exact months and maintenance tasks) can be proposed.