I am trying to get a good picture of the design and build quality differences (if any) between the top of the line Carrier (Infinity series), Trane (XR and XY series) and the Lennox (XC series). All the quotes are coming in about the same, with 2 stag thermostat and 5" media filter.
Main concern is reliability and longevity! Any words of wisdom from the field? Thanks.