Assume my duct work will not handle the excess supply for the three zone system I plan to have installed in my 3500 sq ft, two story house. Let's also assume that it is too expensive to upgrade the ducts. What are my options. I have read about dump zones, which don't seem to have much support and bypass circuits with counterweighted dampers, which seem to be the most common. Are there any other options?
I think I have seen comments about dampers that have some type of electronic barometric control but now I can't find them on the Internet.
Which manufacturers should I be researching for zone systems and controls?
Any comments or advice is welcome.