Marketing and dealer support.
At least around here in the DFW area of Texas, people are more familiar with the American Standard name on sinks, toilets and urinals than on HVAC equipment.
Trane has a well known good reputation for HVAC equipment.
It varies by region, but our local AS distribution is through an independant supply house, and leaves a lot to be desired.
On the other hand, Trane has fantastic distribution and dealer support/training in the area.
[Edited by mark beiser on 11-29-2005 at 08:30 PM]