One of the tips I got from a local yokel when I moved up here, for an uninsulated shop, is to keep the air moving to avoid cardboard rot and rust of everything. That worked for me using two box fans on a timer for about two hours every afternoon. When I went to insulation and heat, I used two of these bad boys to push the hot air back down to the work area instead of letting it sit up at the ceiling. They are a no-joke game changer. I ran l-o-n-g wiring to get the controllers down at floor level for the varied speed control. I wish I'd run wires for reversing the fan direction also but it's too late now. I can live with the downdraft rotation.