Well, unfortunately, the previous owners sheetrocked the lower level ceiling
so there's no access to the duct flow controls for the upper level vents.
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You can accomplish the same thing by covering part of the outflow vents in
the hotest/coldest rooms.
Use tape to partially cover the vents while you are experimenting and when
you get the correct flow to the entire house, you can put a piece of tin
behind the vents, the same size as the tape.
--
JerryD(upstateNY)