You can’t avoid a new air conditioner replacement forever here in St. Charles, MN. Most AC systems last 10 to 15 years, with some reaching two decades, but rarely will they do it without problems; this means that if you notice your system is short-cycling, blowing out tepid air, or malfunctioning in some other way that previous repairs haven’t fixed, then you may need to think about an air conditioner installation. Though the upfront cost of a new AC may be high, you’ll save more in the long run than if you prolonged the ordeal with your current system.