[RKDinOKC]

Have 2 vents and a return in the hall between the living and master.
There is a vent in each of the other bedrooms with a return in the hallway furthest from my hot bedroom. The hot bedroom is about 5 degrees hotter summer AND winter. weird. Felt funny running the ac window unit in the winter.

When the hvac guy did the plenum for the new unit he made the duct going to that room positioned in the Plenum to get the most air.

Have even shoved cameras down the vents to make sure they are not blocked.

Have a vent booster that sits on the vent and runs a fan pulling more air from that vent when it senses air flow. Does not help much.

I am at a loss and wonder if there is no attic insulation over that room.