The answer to 'how often to replace air conditioner' is that most air conditioning units should be replaced every 10-15 years, on average. The lifespan of an AC unit can vary depending on factors like usage, maintenance, and the climate. Proper maintenance like regular tune-ups and filter changes can help extend the unit's life, but eventually all AC systems will need to be replaced as they become less efficient and more prone to breakdowns over time.
It's generally recommended to start planning for a replacement when your AC unit is 10-12 years old. This gives you time to research options, get quotes, and budget for the new installation. Waiting until the unit completely fails often means rushing into an emergency replacement, which can be more costly.