Working in a big office building forces you to submit to the climate-controlling desires of people who don't have to actually sit in your cubicle right under the AC vent. It can be a frustrating experience, especially on those hot summer days where you go from being much too hot to being much too cold, only for them to shut the AC off at 6pm when you're working late, bringing you back to much too hot. You need to have some control over your climate, otherwise how do they expect you to get any work done?
The C2 from Herman Miller is a tiny, climate-controlling device that can adjust the temperature in your cubicle up to a 40 degree increase and an 8 degree decrease. It'll allow you to get some work done without sweating up a storm or requiring a sweater, and no building manager can take that away from you.