Just to clarify, here's an example from my own house. I've never been satisfied with how well my system cools, so I always used to keep the main bath vent closed. My thinking was that since it was a small room, and we were rarely in it for very long, that there was no sense in pumping a bunch of cold air into it. Plus I figured it meant that more cold air would go to the other rooms.
Well it turns out I was wrong on both counts, it's not sending any more air anywhere else, it's not making my system work any less harder, so I may as well have it open. And regardless of where it's coming from, the more cool air you have moving through your house, the better off you are.
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