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I have been looking at air handlers. Im replacing one that is about 15 years old. 3 ton packaged unit. Horizontal, mounted in unconditioned space. I looked at Trane, Carrier, Rheem, Goodman, Lennox. They all look the same to me. A sheet metal box with a fan and a drain pan. Is their anything better construction wise? I was thinking of something double walled with foam insultion or whatever would be a better approach than lining some sheet metal with duct board. Something easier to keep clean? So far, I think I like the trane the best. It just looks a bit better assembled but not much. Could be the flashy logo.