I recently had two Trane XR80 furnaces installed. They replaced a 75000/60000 Carrier and Goodman furnaces (80AFUE). I clearly specified to the contractor that I wanted Trane B, 60K furnaces as replacements. The contract we signed had a column marked only ‘capacity’, with 60k listed and ‘B’ model. Of the 4 B models, 3 have ‘nominal output capacities' of either 63-64k—the other has a 47k output. I have just discovered that what they installed were B models, but the one with 47,000 btuh output. All the Trane installation docs (Installers Guide which they gave me) and the docs on the Trane website clearly list ONLY ‘nominal output capacity’. The contractor insists that he uses ‘input capacity’. I do not find ‘input capacity’ specficially referred to in any Trane docs. The contractor insists that the ‘industry standard’ is to refer only to ‘input capacity’, even though his sales contract does not say either input or output capacity. I clearly was using the Trane docs to order 60k output, not input. I intended to replace my Carrier and Goodman furnaces with exactly the same capacity. Am I at fault here? Has the contractor take advantage of me? Is ‘input capacity’ the ‘industry standard’ for quoting furnace capacity? Thanks for the feedback.