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Question:

What will cause gas furnace heat exchanger fail before it is life expectancy?

we are looking at a 7 year old foreclosure home, there is black soot from furnace in all the room. People suggested the house gas furnace heat exchanger might be broken, I wonder what is causing it to be broken in such a short time. Any hidden problem?

Answer:

Water dripping off the AC coil onto the heat exchanger will rot it out quickly
Overfiring, overheating, short cycling, component failure, those are the most common reasons for a heat exchanger for crack in a short period of time.

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