The answer to 'lifespan of HVAC repair' is that the lifespan of an HVAC repair can vary greatly depending on the specific issue and the age of the system. In general, many HVAC repairs can extend the life of your system by several years. However, if your system is older and has multiple issues, it may be more cost-effective to replace the entire unit rather than continue repairing it.
HVAC systems typically last 15-20 years with proper maintenance. Minor repairs like replacing a thermostat or cleaning the coils can add 2-5 years to the system's lifespan. More significant repairs like replacing the compressor or blower motor may extend the life by 5-10 years. But if your system is 10-15 years old and needs multiple major repairs, it's usually better to invest in a new energy-efficient HVAC unit.