It's sad how many AC repair companies only try to sell new HVAC systems when your current equipment is perfectly fine. Even 15 to 20-year-old systems have plenty of life left in them if you care for them properly. We'll replace your old system if that's the best choice, but shouldn't we at least try to fix the one you've got? Keep your hard-earned money in your pocket as long as you can, and hire someone who wants to fix your system right the first time.