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?
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.
