You have a lot of great suggestions here. My sewing room does have a wall a/c unit, but I also keep a larger fan oscillating on top of my bookshelves, and I use a tiny little round fan right next to me at the sewing machine, blowing in my face. I know it's our irons that throw most of the heat, but I have to keep mine on ... I hate waiting for the darned thing to reheat if I shut it off!