The HVAC system in our office is all sorts of messed up. In the back of the office, it's like the Amazon rainforest, it's so hot. Up front where I am, it's @$$-cold all the time. I kid you not - I have my space heater going the entire year - even on 90 degree hot summer days.

To keep warm in winter, I always have an extra jacket/sweatshirt at my desk, the space heater, and a huge supply of tea and hot chocolate.