Afraid air conditioning is the only real answer.
I have central AC rather than a window unit. If I leave my room door closed, the heat just rises and rises. In the summer I've pretty much adapted to my room being 80-84F most of the time. The AC is set to 75F, but the heat isn't in the hallway to trigger the thermostat, it's in my room. When I get desperate, I put a box fan in my doorway to blow the cool hallway air into my room, it works. Otherwise leave the door open with a ceiling fan on to move that hot air out of the room and hopefully trigger the thermostat. Turning on the central fan without the ac can help with that too I guess, but I never really do that.
I don't believe in turning the thermostat down further.
Ideally, I'd just get a window ac for the room where it really matters, but I just haven't been bothered enough to do that. I would suggest a window ac for the hot room if you are really bothered, and leave the central ac off.