We recently moved into a 12 year-old two-story house, and the master bedroom gets uncomfortablly stuffy at night whe we sleep with the door closed. It doesn't matter if we are running the furnace or the A/C. I noticed that the master suite has 4 equal-sized inlets but only a single return register, about the same size as one of the inlet registers. Should the area of the return equal the area of the inlets? Each of the additional smaller bedrooms in the house has a single inlet and single similar-sized return, and they do not get stuffy at night.
Thanks in advance,