

If you want to be healthy, you need fresh air. Position the desk for sunlight if you're not using double/triple pane (which block out a LOT Of the sun's heat) windows.

It would allow people to really save on their heating bills in winter.

But that would allow one to work in perfect comfort in temperatures below freezing. Getting in and out easily is the challenge. I've been trying to design some sort of poncho thing that would drape over the desk and around the chair. Your hands might start to sweat! Another option for heat (say in the morning) is to use a hot water bottle. You could get some dryer ducting (about 4" in diameter) and attach that to the output fan of your PC case.
WARM HANDS COLD HEART SKIN
You probably won't even need a heater in there as the skin radiates a surprising amount of heat. Put something soft on the top of the desk, not only for comfort for your forearms but also for heat retention. The blanket will conform around your wrists giving a pretty good seal. I draped a blanket over it (ideally line the inside of the box with Styrofoam or other insulator so the heat from your hands and wrists is not wasted) and let the blanket drape over the front. I just got a box slightly bigger than my keyboard/mouse and plopped it on top. I'm curious as to what your temperature was. The ambient temperature in my place was often below 10C/50F and I had to type. And you could always make the top out of glass to clear that little hurdle.
WARM HANDS COLD HEART HOW TO
I'm assuming most of you know how to type.lol. This only works of course if you don't have to look at the keys.duh. That keeps its in place otherwise it will just slide up your hand away from your fingers. Remember that the mitt still goes between your thumb and fingers. It would allow finger mobility and keep your hands as warm as possible if you don't use the solution below which is far superior. Lots of room! One way is to get some mitts and cut off the thumb and area right around the first joints of the fingers. An arctic explorer once said if you want warm hands your hands should fit in your mitts like a car is parked in a garage. You can use hand warmers but the best is to make sure there is no constriction on the skin - usually impossible with gloves thanks to sloppy design.
