Are your vents adjustable? go throught the house and close off vents you don't need, and restrict vents in small rooms. In our house the bathroom has the same size vent as my room, so I closeed that one off about 3/4 of the way. I also closed 2 of the 4 vents in the living room and restricted the hallway vent to about 10% air flow. It took some experimenting but I now have the whole house getting the right amount of the AC flowing to it. If you don't have adjustable vents, that would be a somewhat small investment to make to get a cooler room. Cheaper than a window AC unit anyhow.
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