The answer to 'how often to replace AC' is that most air conditioning units should be replaced every 10 to 15 years, depending on factors like usage, maintenance, and environmental conditions. Proper maintenance and regular tune-ups can help extend the lifespan of your AC system, but eventually all HVAC equipment will need to be replaced as it reaches the end of its useful life.
When considering replacing your AC, look for signs of aging like increased energy bills, more frequent repairs, and reduced cooling performance. Newer, energy-efficient models can also provide significant cost savings over time. It's generally recommended to consult with a professional HVAC technician to assess your system and provide guidance on the right time to replace it.