Can someone explain to me why lower level product lines tend to outperform the high end lines on higher ton systems? It seems like the Carrier Performance 16 outperforms the infinity systems at higher ton ratings. Is it because of the two stage system in the infinity. The infinity system doesn't even get to 17 SEER in their 5 ton size. If Trane comes out with a tax credit eligible unit, someone said it will be in the xr series. When it comes to higher tonnage units, I guess it is all about comfort and not energy savings if you want to go with the top tier product lines.
What are the best performing 5 ton systems out there? It seems like the Trane xl20i is one of the best exceeding 17 SEER and having an EER of 11.5. It seems like it almost meets the tax credit criteria. It would just need to bring up its EER by 1. Does anyone think they will be able to do this in the near future? I'm referring to a variation of the 20i.