There are a number of contributing factors that determine the age a furnace reaches.
Trane gas furnace life expectancy.
If you follow this reasoning your 30 year old appliance has already doubled its expected lifespan.
If your furnace was correctly sized for your square footage and installed by a licensed technician you can expect a long lifespan.
Some sources report the average lifespan of a gas furnace to be only 15 years.
The quality of the equipment.
Furnace life expectancy like any other product will vary greatly for a number of reasons.
The life expectancy of a furnace depends on several factors.
The good news for those who choose to go with a trane ac unit is that these days the expected lifespan for the unit is 15 20 years.
Typical american standard furnace heat exchanger warranties are 20 or 40 years.
Air conditioning unit life expectancy.
Many owners elect to replace units closer to 10 15 in order to upgrade to a more efficient model.
So the answer to the question how long does a furnace last is complicated.
Regardless of the logic you follow the 30 year mark is at or close to the maximum lifespan you should expect from your furnace.
Between 15 and 20 years.
A builder s grade unit may only last 8 to 12 years because it s not built as durably.
With regularly scheduled maintenance your furnace could last anywhere from 15 years up to 25 years.