I have a Camelia and the master suite is the coldest part of the house by about two or three degrees. By the way, the master bedroom does have its own return vent.
The main problem seems to be the architectual design itself that impedes the heat balance. The master suite is the second largest area in the house, yet its main heat source is the one bedroom size ceiling vent and the voluminous master bath has only one bathroom size vent to heat all that area. The very small closet size vent in the toilet doesn't contribute much of anything and neither do the other two walk-in closet vents. The master suite could have used a vent sized like the three main vents in the kitchen, dining room, and living room. Our master bedroom has a "tray" ceiling which is two foot lower than the ten foot ceiling in the master bath. Unfortunately, most of what little bathroom heat you have is trapped behind the wall over the archway that transitions from the ten foot ceiling to the eight foot one and never reaches the master bedroom.
As a bit of history, when the Camelia/Gardenia series was first built, the master bedroom suite had a ten foot vaulted ceiling in its entirety. Since the master bath and master bedroom had the same height ceiling there was an even flow across the ceiling between bedroom and bath. However, there was a problem with the vaulted ceiling in the master bedroom area where a stress crack would appear. This was a chronic problem and the solution was to create the lower "tray" ceiling in the master bedroom that is now seen in the later versions. While that may have solved the crack issue, I believe it created the imbalance in the heat and lack thereof that is referred to above.
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