Appreciate the recommendations and the many points of inquiry. Will dive back into this one once all three of the companies review our current state and write up the proposals.
The dealers representing Carrier and Lennox have been presented. Trane next Wednesday.
Spey- a lot there. In short, the are all authorized dealers for their products. Am in process of doing the deeper dig you suggest.
At least three different options as to the operation of the furnaces. On/Off, Two Stage, Three Stage which is always on, moving air around. Also some other voodoo with multiple speeds, settings, sub-settings and expense.
One of them suggested like-for-like systems across all manufacturers.
As far as ratings, it's kind of the perfect storm.
Trane equipment gets the best reviews. The local Trane dealer has the least favorable reviews.
Not find much at all on Lennox, other than they have a relationship with Costco, so there is that.
Best reviews are for the local installer of Carrier but not much in online chatter one way or another on that.
It will all work out in the end.