A heating or cooling system is a substantial investment, and it only makes sense to make the most of it.
In general, most HVAC systems will survive 15 to 25 years, but this estimate can be highly varied depending on the type of system and other factors involved.
No matter what kind of HVAC system it is, there's a set period or life expectancy. In simple words, it will eventually stop working after 20-25 years.