Hi! I just bought a home and was curious about the gas furnace and wether or not I should have it replaced. The previous owners said they never had a problem with it, but I can't imagine that it is that efficient. The paperwork for the purchase of the furnace is dated from 1992. The brand name is Goettl from Arizona. (??) I just received my tax credit from the government and have the money to replace it now, but, there are other improvements I would like to make to the home. Is it feasible to expect any more than 4-5 more years out of it? Will the savings in utilities alone be enough to offset the costs in a few years?? Any thoughts would be helpful. Thanks!!