On Mon, 11 Mar 2013 07:28:54 -0400, Ed Pawlowski wrote:

On Sun, 10 Mar 2013 19:46:17 -0700 (PDT), "
wrote:

Can a heat exchanger be replaced or repaired on a gas furnace?


Sure. Given it is old enough to rot or burn out, it is probably more
sensible to upgrade to a much more efficient unit. It will save a
bundle of money in the long run.
There were some furnaces where the heat exchanger failed early - and
replacing would be an effective and sensible repair. In most cases
though, replacing the entire furnace would make more sense.