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That is right in line with the market in metro Atlanta and if they are replacing an entire trunk line and mastic all the connections for 1,100.00 that is a great price. This system does qualify for the 1,500 tax credit as well. I would make sure you ask them about the line set though make sure if you are getting this high end system that you have the correct sized line set. If the existing is too small and they use it you will not truly get the SEER you are being quoted.
American Standard is the same company as Trane and the AS line is actually the higher end. It's like Toyota and Lexus with the Trane being Toyota and AS being Lexus.