It's not clear to me what the Trane ComfortLink II communication does, and my potential contractors don't have much of an explanation (it makes the system more efficient - ok, but how so?). It seems to only exist in the top of the line XC95m furnace, XL20i AC, and XL20i HP. And only in the XL900/950 Thermostats (therefore apparently required).
So could someone explain what benefit this feature might have?
The XC95m/XL20i AC is obviously Trane's top of the line furnace/AC combination. But is the benefit of the ComfortLink II communication (whatever it is) lost when the XL20i HP is used with another furnace? It wouldn't seem to make a lot of sense to combine the most expensive XC95m furnace with a HP when the furnace is (should be) used so little (just in the coldest weather).