The frozen North... Well, the garage is insulated (WELL) and it usually stays in the low 50's without any additional heat. Of course, we haven't had the garage door itself open more than a couple times in the past few months. We'll see what happens when the last batch of donation stuff is removed and we can get the car in there regularly. I have a small ceramic heater in there set to oscilate and blow hot air. It does a pretty good job of taking the edge or chill off the air if I turn it on a couple hours before I want to be out there. It'll keep the room in the 60's easily. Sometimes I prop open the door to the house for a few minutes to circulate the air in and out, especially if it's hot in the house. My wife also got me a parabolic electric heater that's pretty directional to use when I want to just go out there and be at the desk. It will eventually heat the room but is really best to warm up one spot quickly. I've also got carpet remnants scattered around along with small rugs to keep the feet off the concrete. This is especially nice if I want to just run out and grab a magazine quickly.