The answer to 'how long does preventive maintenance last' is that the frequency of preventive maintenance for HVAC systems can vary, but it is generally recommended to have your system serviced once or twice per year. This includes tasks like cleaning and inspecting the components, checking refrigerant levels, testing safety controls, and ensuring the system is operating efficiently.
Regular preventive maintenance is important to extend the lifespan of your HVAC equipment, improve energy efficiency, and catch any potential issues before they become major problems. The exact maintenance schedule will depend on factors like the age and type of your system, how often it's used, and the manufacturer's recommendations.