I'm sure this question will illicit all sorts of philosophical comments, but I'm just looking for some opinions rather than stir up trouble.
Information I've gleaned has led me to believe that, on average, older HVAC units tended to last an amazing long time----they been real workhorses under all sorts of conditions. Even my exising H.P. and gas furnace is now 20 years old.
So, the controversial question is: How long can a homeowner expect new modern units to last ?
What do you guys, that work in the HVAC field, see as far as major failure, where the cost of labor and parts outweighs things ?
Disclaimer: I don't want to open a can of worms here, so this is all assuming that a homeowner has regular quaility maintainance done, and the unit was installed by a company that did a quality installation.