Opening the windows and letting in some fresh air is a good suggestion, and this has been a concern for quite a while. One option is to put an air to air heat exchanger in a closet by the outside wall. You bring fresh air into the house via the heat exchanger and stale inside air exits. It's basically a radiator that allows the incomng air to absorb the heat from the outgoing. There is water condensed out of the cooling air going out so that has to be caught and managed. The dry incoming air then goes to the furnace if you have one or is cycled through a fan if you don't or if you're not in a heating season.
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