I have spoken with several HVAC contractors regarding replacement of my
old Lennox central air conditioning system. All of them are Lennox
dealers except one who also carries Trane products.

The dealer who also carries Trane was trying to switch me from my
original Lennox preference, stating that the Trane coils, which are 100%
aluminum, rather than the Lennox coils, which use aluminum fins and
copper tubing, provide a better, longer lasting design.

He felt that Trane was superior in other ways also, since they used
"composite plastics" in the outdoor condensing unit case rather than
steel to ensure that no corrosion or rusting would occur.

The basic claim was that Trane, using aluminum for all of the
refrigeration loop, had a longer life expectancy that Lennox, given the
newer Puron refrigerant.

Does anyone have any experience with Trane, and is there any science to
support this type of claim or any other prior experience to say that
Trane is somehow better?

Thanks for any advice.