While the carrier greenspread is a great system installed and sized properly but what if needs maintance or warranty work done? Since summer is coming and they are a good ways alway. Just something to think about.
The xl16 is not a bad system but does lack good dehumdity control in certain cases like all (2) stage 1 compressor systems. If I have a customer that is looking at xl16 I always suggest a XL20i for the simple reason of true (2) stage system with (2) compressors with a 50/100 % ratio of operation.
With the Xl20i odds are they will be in the same price backet as carrier greenspread while diffrent concepts with the same results intended which is the best comfort, energy saving etc...
I would ask your Trane dealer to work up the price Diffrance between xl16 and xl20. More then licky the rebates, incentives etc... Will also apply towards the XL20 as the XL16 in some cases greater depending on current promotions and seer rating both for electic company and Trane.