I have a nice Trane AH w/ an EAF, it's a 2007/8 model (TEE prefix). It has the coils and is all set for a HP -- currently electric heat only ($$$). Can I pair this w/ a new Tempstar 2-stage unit, while also making use of the Trane's VS fan (assuming use of a very capable t-stat)? Humidity control would be nice as well.

I can't afford the Xl16 now. I'd also like to reward Tempstar because of how happy I was w/ it's performance and reliability at my previous house.

1000 feet elevation in Willamette valley of the Pacific Northwest, so all about the HSPF - cooling is an added luxury for a few days out of the year.

(1600 sq ft ranch)