It’s often a judgment call. Like a car, once repairs aren’t cost-effective to make then it’s probably time to consider purchasing a new system. Pay particular attention to your compressor — once it starts to go, you might be better off buying a new unit than trying to repair the old one. We will give you options for both if it is in your best interest. If your ac system is over a decade old, a new system will certainly save you more money on your utility bill. You will recoup your investment within a few years depending on usage.