CW, what you say about single or central return air grills is certainly true of older homes. Since the advent of home air-conditioning homes have been constructed with a supply and return for each room (exception bath rooms and kitchens). Given what you mentioned, the alternative would be not to close the doors tightly, but to leave them slightly ajar. The premise behind the idea is to create a system that forces air back down the stair to the basement there-by making more of the conditioned house air help to condition and reduce the humidity o the basement.
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