delislej

The furnace was indeed built in September of 1967, so it is the original. As you've read in the previous posts, this model of furnace has an excellent life expectancy - 60 years. And, it is trouble-free. The chance of you have a life-ending failure is remote, but if you've got the money and are investing in the future of the house, then it's as good a time as any to upgrade. However, if you are thinking of replacing it because "it's old", or "it's got a crack in it", or "it's very rusty", then get a second opinion. Other than a hole in the heat exchanger or a burner damaged beyond repair, everything else on the furnace is a fairly low cost and straight-forward repair. Thanks!

I have an Airco Model AH-75 serial 1F3-97 or IF3-97. Any idea on age? Name plate appears to be a label and not metal, and has more information than the 60's ones I see here. The house was built in 1967 I believe, and the furnace looks original.