I won't room with fat people because they always want the temperature turned down
What fat people are you referring to?
I think a few of my friends are fat
I think that you should reconsider. Making assumptions about people like that is so wrong. You can't base your opinions on their appearance.
This is from first-hand experience.
Even so, you are assuming all fat people will do this purely on their appearance. That's wrong, and you need to stop it.