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Point the fan IN to your room from the hallway. This will displace the hot air by forcing cooler air into the room. If you point the fan out your are forcing hot air from the hallway IN to your room and pulling the cool air OUT of your room.
Where is the second floor return (intake) duct for the A/C. You probably need one in your room; I don't know how feasible that is.
If the return is in the hallway you can cut a hole in the top of your wall next to it ( or close to it ) and put in a vent that would hopefully improve airflow. Nothing fancy, just a hole in the wall with a return air grill on both sides.
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