Our new place came with a 900 square foot outbuilding. It is on concrete and has 2 garage doors. I would like the ability to warm it up when I am out there working. This would not be a lot, maybe 3-4 hours a few times a month during the winter. I know if I were using it more often, it would be worth insulating it. I am considering a kerosine forced air heater that I will just run occasionally to bring the temp up. I also have a smaller older wood stove I could install, just not sure it would be worth it and not sure it would produce the heat needed to bring the temperature up in the uninsulated building. What’s everyone think?