Don't think any one said longer warranties make one better than the other, but when you spend the higher $$ for the top models which are priced very close of each manufacturer, warranty protection is something that becomes part of the mix.
Trane has just introduced a new air filtration device, one step above the ESD unit.
http://www.trane.com/Residential/Cle...anEffects.aspx
[Edited by kevinmac on 10-19-2005 at 12:43 PM]