OK - My wife got the Trane reps out. Did the heat loss analysis. Recommended a 3 1/2 ton. Neither the 16i nor 19i come in 3 1/2 ton. Said would have to redo duct work to go to 4 ton, but not really needed. Recommended the 3 1/2 ton 15i (16 SEER), which looks pretty good on the internet.
I see the 15i and 14i are grouped together. Since we plan to do an addition (and that won't be until later in the year after I get home), I'm thinking that I can go with the 15i now, and look at adding a second zone and heat pump and redo the duct work when we do the room addition.
Here's my final questions:
Is the 15i worth it?
Can you zone the 15i?
Does it make sense to go with a 3 1/2 ton now and add the additional unit when we add the add'l sq ft?
Thanks again for everyone's help. JW