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I can say I am not a fan. Yes they are supposed to help with getting air refreshed when doors are shut and eliminate the "ghost closing" of doors when the AC kicks on but this is my first house with them and it seems to not do a good job of getting the front of the house refreshed. The "front" of the house is furthest away from main return grill.
Its a new construction so I have had the AC people out several times trying to get it to cool down. They even changed one of the jump ducts to actually tie into the main return. That seems to have helped a bit but I would prefer all returns going to unit and not rely on only one main return with a bunch of jump ducts.
I have a single story 3500 or so square feet.
I'm confused why you would not have a return air in every bedroom for a new construction home of that size. Maybe I'm ignorant but I just built a house and been through 50+ new constructions over the last year and I would say 99% had a minimum 12x12 return in every bedroom/office. I assume that was standard now.
Are you actually seeing the duct connections in attic? There are 12x12 return vents in all the bedrooms but they are "jumpered" to a bigger return vent in a hall way instead of back to furnace. The thinking is the main return would "pull" the air out of the connected rooms via the jumper ducts instead of having dedicated returns. This would also let the air go somewhere instead of getting pressurized in the room when a door is closed. The air would be "pushed" into the hall way.
I had the AC people come out on Saturday and I was telling them about the house cooling too fast and having high humidity levels and they lowered the fan speed. This seems to have helped out a lot. Lowering the speed allows the air conditioner to run longer eliminating more humidity causing the house to feel more comfortable. So my experience with jumper ducts could have been a problem with actual fan speed instead of a jumper duct issue.