Tab;
My bathroom vent closes completely. I keep it about 90-95% closed and it works well that way.
KATHYW;
As far as the A/C in the bed room, many days we just run it and not the main unit and it keeps the entire coach cool with the air directed through the door to the bedroom. I keep the rear vents throttled way back (about 25% open) to direct more of the air flow out the front. At night I just run the main A/C set on 70 and it does a good job of keeping the bedroom cool. The dump on the main A/C is only about 20% open. When the temps go above 90, we run both A/C's and even at 105+, they maintain 73 to 75 with no problem.
John