One of the biggest questions homeowners have when it comes to troubleshooting HVAC systems is, “How do I know that a repair is going to be less money (in the long-run) than a replacement?” While a definitive answer will have to come from your trusted Service Tech. Here at Moon and Freeman Inc., a good rule of thumb is the rule of the 3rds. In the first 1/3 of an HVAC system lifetime, regular maintenance and slight repairs are to be expected. In the second 1/3 of an HVAC systems lifetime you should begin to start testing efficiency and really question repairs vs. replacement of the aging unit. In the last 1/3 of the manufacturer’s suggested lifetime, replacements a growing concern and you should expect a unit to begin failing any time soon. This is when you really want to start preparing for that HVAC replacement.