I will be sharing a 30x40 garage that remains unheated. The unit heater gets turned on only while working on cars, and then when done gets turned off. This is fine, and this is how we want it. What is not fine is holding onto tools that are ice cold. Air tools will hardly work when they are ice cold, battery tools also have crappy performance. I had a first thought of getting harbor freight fiberglass welding blankets, then sewing on some commercial moving blankets and making a tent frame to place around the bank of tool boxes. Then using (2) 100 watt light bulbs to keep them at like 50 degrees or so. I would be open to any other ideas.... Needs to be fire proof, and needs to be cheap.