My basement and main floor are 900 sq ft. Upstairs is 1300 sq feet. I have a single furnace with about 9-10 registers upstairs, 5 or 6 on the main floor, and 2 in the basement. In the summer I close both the registers in the basement, and have 3 open on the main floor.
The only way I know to isolate floors is to install separate furnaces; is part of that quote adding an extra furnace? Typically they would have one furnace for the upper level, and the other for the main floor and basement. I also have a friend who only installed A/C upstairs, and lets the cold air trickle down as needed.
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