There is another thread with a similar question, http://hvac-talk.com/vbb/showthread.php?threadid=80370, and rather than try to hijack that thread, I‘ll pose my question here as a separate thread.
Two years ago I had a complete furnace (TVX120R9U5V) & AC replacement with a Trane XL14i 4-ton AC compressor unit 4TTX4048A coupled with a RX054S evaporator coil. Of the three proposals I obtained, two contractors quoted the RX054S coil while the third contractor quoted the TXC048 evaporator coil unit. When I pointed this difference out to the third contractor, he agreed to supply the RX054S coil for the same price. The third contractor that ended up doing the work said that I would probably get better humidity control with the RX054S than the TXC048 coil.
The furnace and AC have worked flawlessly since and I couldn’t have been more satisfied with my contractor selection. Incidentally, the installing contractor was the higher priced of the three but the spread was only a few hundred dollars. The new installation has made a major difference in the gas and electricity used and the comfort level is much improved over the replaced system that was 29 years old. But in the back of my mind I always wondered what were the major differences between the two coils, the RX054S and the TXC048, and which coil would have been a better match? Would there have been a major SEER rating between the two coils?