Heres the meat - just bought a small ski lodge off a friend which a rusted out furnace (think it was a trane but can't recall for sure). Lodge has a real nice control system - has three fireplaces so place is zoned. Actually seeing how well the system worked last winter is reason zoning my primary residence.
The problem is that unless I want to revamp the zone control what I need is a two stage furnace which on 1st stage delivers 600 CFM or less and on 2nd stage delivers around 60,000 Btuh. Everyone I've looked at on 1st stage run 700+ CFM.