Even if there is no medical condition, this problem begs for the simplest of solutions. But, as Bradley so well says, how a request is made makes all the difference. Before going to talk with the manager/supervisor or HR, write out a scenario of how you’ll present the problem. Read it over, even practice it. Don’t just present the problem with the expectation that something will be done, however. Be ready, before being asked, to offer a solution yourself, a solution researched in advance that you know is possible to effect. Maybe that means talking the issue over with a co-worker who has the opposite problem and wouldn’t mind sitting where he can feel the cold wafting in. You won’t know until you stop feeling the need to complain and begin seeing how you can be part of the problem’s resolution.