I'm trying to diagnose a problem, but don't know where to go from here.
Master Bedroom is always 5 degrees colder than rest of house. We've only been here two years, but it seems to hold true in both heating and cooling season. I run the system in continous fan mode, if I turn this to "auto" the temperature difference is usually 8 degrees.
I have a 1.5 story house, (Two separate HVAC systems, one for each floor) the room in question has attic space above (insulated). The master bedroom has a large window on it's exterior wall, which gets moderate shade from trees, and faces NE (Austin, TX)
The original duct plan had a large return in the master bedroom and another bigger one in the hallway outside of it. I had dedicated returns added to most doored rooms in the house (excepting bathrooms, closets, and the utility room). So the Study, and 2 other bedrooms have dedicated returns).
I have this feeling that they didn't balance it right, but if that were the problem wouldn't I notice something along the lines of that room being too hot in one season and too cold in the other? I have this thought that too much air is being "sucked out from this room, both from the return in this room and the one just outside of the door (originally designed to service the whole downstairs except for the master). There is a 3/4" to 1" undercut on the door.
I bought from a semi-custom builder. So the system was modified from the stock plan. This was not a retrofit. well, at least it was all installed at once
The utility room for example when in heating mode gets noticeably warmer than the rest of the house. (no return in this room, door shut, it makes sense), but not the master bedroom.
Attached is a scan of this part of the house. I drew in the returns (not to scale)
Ductwork are flexible insulated (R6) ducts.