The answer to 'when to service installation' is that HVAC systems should be serviced at least once a year, ideally in the spring or fall before peak heating or cooling seasons. Regular maintenance helps ensure your system is running efficiently and can catch any potential issues before they become major problems.
During a service visit, an HVAC technician will inspect the system, clean components, check refrigerant levels, test electrical connections, and make any necessary adjustments or minor repairs. They may also recommend replacing air filters, which should be done every 1-3 months depending on use and indoor air quality.