Can ac last 20 years?

Older HVAC units tend to be less efficient than newer models, and as they age, wear and tear further reduces their efficiency. While a replacement HVAC unit is a significant investment in your home, it can make more financial sense if it saves you money on repairs and utilities over time. Since the average age range of an HVAC system is 15 to 25 years, you may wonder how efficient your 20-year-old system is and if it's time to consider replacing it. Most 20-year-old HVAC systems are at the end of their lifespan, and if their maintenance and operation are becoming increasingly expensive, it's probably a good time to consider the possibility of replace them.