The answer to when to service an air conditioner is that it should be serviced at least once a year, ideally before the start of the cooling season. Regular maintenance helps ensure your AC unit is running efficiently and can catch any potential issues before they become major problems.
During a service visit, an HVAC technician will typically inspect the system, clean the condenser coils, check refrigerant levels, test electrical components, and ensure all parts are functioning properly. They may also recommend replacing the air filter, which should be done every 1-3 months during periods of heavy use.