I'm sick of this. I'm just going to ask my new landlord/roommate to turn the goddamn heat up
Why do you need to ask them to turn the heat up
I want it to be warm and they have the heat set too low.  I don't like the cold.
I feel for you that you feel cold and you feel uncomfortable in your current living situation, but I still would ask your roommate or your landlord politely and not being angry at them while requesting to turn the heat up. They may not know that you are cold and that you are uncomfortable, so they may not know that you're not liking the temperature, it's not their fault.
I'm not planning to be polite about it.
The heat is obviously something that the landlord has control over. If you're rude to them it's very unlikely that they'll feel like turning it up. Don't you want to feel warmer?