The answer to 'when to replace tune-up' is that HVAC tune-ups should generally be performed annually, or every 12 months, to keep your system running efficiently and prevent costly breakdowns. During a tune-up, an HVAC technician will inspect, clean, and adjust the various components of your heating and cooling system to ensure optimal performance.
Over time, normal wear and tear on HVAC components can reduce efficiency and lead to more frequent repairs. Performing regular tune-ups helps extend the lifespan of your system and can identify potential issues before they become major problems. Most manufacturers recommend annual tune-ups as part of the regular maintenance schedule to keep your warranty valid.