@silvrr, thanks for the feedback. We do have 2 dampers in the ducts, but they really just control the right/left hand sides of the house. There seem to be no additional dampers where ducts fork from there. The vents are all open and there is only 1 large return on each level. The house is pretty poorly insulated/sealed. It’s not ancient, but it’s old enough to have lesser insulation requirements when it was built. We’ve tried adding attic insulation and blowing additional insulation into walls in many areas. Windows are pretty old and seem to be poorly sealed in some areas.
My main motivation is to try and use smart vents to offset some of these issues in a cheaper way. I figured getting smart vents at $70-$100 each would likely be MUCH less expensive than replacing all windows in the house and upgrading insulation, etc. I’m just trying to figure out if these smart vents actually work well enough to justify the cost or if they are more of a gimmick with little impact.