I recently received fairly similar quotes for a Bryant 5 Ton vs. an Amana AMH8 (AM480804B). I have a large townhome on 3 levels approximately 2000SF. I live in Southern CA. so that is a factor in the system that fits my needs. This Townhome does not retain heat very well, old windows, I also have a cathedral ceiling; (25ft) in the living area on the 1st floor as well. The garage is built - in, so cold air gets in from down there also. The Amana 2 stage system appears to be a slam dunk with the two stage capabilites, but have read that the 2 stage factor is something of a misnomer. Any ideas? Thanks for your help.