The answer to 'how often to replace AC' is that most air conditioning units should be replaced every 10-15 years on average. The lifespan of an AC system can vary depending on factors like usage, maintenance, and climate, but with proper care, most units can last between a decade to over 15 years.
Regular maintenance like changing air filters, cleaning coils, and scheduling annual tune-ups can help extend the life of your AC system. However, even well-maintained units will eventually need to be replaced as components wear out over time. Signs it's time to replace your AC include reduced cooling capacity, frequent breakdowns, and higher energy bills.