Your workmates sound like a bunch of tools t.b.h. If you're cold and they say "It's boiling in here" again, you should stand up for yourself and say "just because you're all too fat to feel the cold." and then close the window at your desk anyway, then if someone tries to open it again say "Sorry it's against health and safety to change MY working enviroment without reasonable cause, cold breezes cause my neck to become stiff and get headaches and If I had to go to the physio to get it sorted it would cost us (the company) a lot of lost production" etc etc.