I'm sewing in the attic now, which gets extremely hot at times. None of the screens there are very snug, and with wasps around, I can't open the windows much. (I get exercise running from them occasionally!) I have a little fan, about 8 inches in diameter, which I aim more at my waist down when I'm sitting at the machine. I adjust it as I move around the room. Having that small fan is a life saver without having everything flying around.