I had problems as well when I had a closed in shop in Idaho. Got relief when I put a 6 inch muffin fan on a plywood plate and stuck that in the window while I was working. Opened a window on the far side of the house in the winter. The nice thing about the fan pushing the air out of the shop was that the fine sanding dust would go out too. That is a big irritant as well and seems to travel forever. There are a lot of fumes and particulates we create in this hobby so an exhaust fan is a good idea.