If I could swap out the burner & ignition system for a higher efficiency unit that would be fine. If I had to replace the whole standing unit that would be impractical. Just getting a new unit in and the old unit out would require the moving of too much "stuff", walls, etc.
I could get 50 or 60 pound sub-assemblies about the size of the blower unit in there without too much trouble, but not a whole cabinet.
If there isn't a "guts replacement/upgrade kit", maybe there should be.
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