The life expectancy of a home HVAC system is around 10-15 years for a well-maintained system. However, factors such as usage, environmental conditions, and maintenance history can impact the lifespan of a system. Regular maintenance, such as annual tune-ups, can help extend the life of your HVAC system and prevent breakdowns. If you have an older system and are experiencing increased breakdowns or decreased efficiency, it may be time to consider a replacement. Consult a licensed HVAC professional for a personalized assessment and recommendation.