Seriously Tired Of Being Cold

I have busted my tail to make my thyroid healthier, but I still sit freezing most of my day. Why? Because my office is so freaking cold! Why must they keep it this cold, I have to ask? Does this constitute a hostile work environment? I spend my whole day shivering. It is sad when the A/C is out on my car, it is 100 degrees outside, and I have to be 20 miles down the road on the way home before I even start to sweat, because at that point I'm finally thawed out!