I have a 24 X 24 detached 2 car garage shop. I do not keep cars in this garage, it's my workshop. I insulated it pretty well when I built it. Due to the garage doors and windows I know the insulation is not air tight. It also has a very cold concrete floor. 9 foot ceilings as well. Just wondering what size pellet stove (BTU's) would do the job for this space. I live in Eastern PA. Anyone interested in selling a used stove in my area I would be interested. Thanks