Should I keep my Lenox G8-110c or replace it?

[tay666]

I have decided this is the year that I will finally get central air for my house.
What I have not decided is if I should replace my furnace at the same time.
Yeah, it's almost as old as I am, but it also works perfectly fine.

I am in NE Ohio, in a 2000 sq ft, 2-story 1890's house with original plaster and lathe walls and no insulation in the walls. I have insulated the attic a bit. Will be adding more once I finally replace the last circuit of knob & tube left in the house. The windows are double-paned aluminum, installed in 1970.
I mention this, as I know a new furnace will be more efficient, but I don't think the savings would really give me much ROI.

Looking for thoughts and opinions on keeping my 58 year old furnace.

 

[Fitter30]

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[Fitter30]

With a new furnace the ac coil in a factory cabinet will be matching and the air flow through the coil has been tested for the correct air flow. Where with a Older furnace its cabinet will be larger and the ac coil might choke some of the air off flowing over heat exchanger.

 

[tay666]

Good point. I hadn't considered that.