Help?

so I'm in college, I share a room with three other girls and the thermostat is on the other side of the dorm. anyway, I've been having this war with my roommate over the temperature. for some reason she feels the need to either turn the heater on (even though it's hot as hell outside, otherwise I would've owned my window) or turn the stat to damn near 80 degrees. it's almost summer here, it's humid and hot. the dorm is literally making me sweat and I'm at my wit's end because I turn it down and she turns it back up. I don't know what to do. 🤦🏾‍♀️ I feel she should be considerate being she isn't the only one who stays here and if she's cold she can bundle up or close her vents, not make the rest of us suffer. does anyone have opinions/experienced anything like this?