[GrabberGT]

I've tried the foil wrapped bubble insulation from Home Depot. I'd like to think it helps a little. I have no insulation in the outer walls with the only insulated portion being the one wall connected to the house. When the temps outside are over 100 I'll shut the garage door and leave the door open to the house with a circulation fan to move the cooler air around the garage. This will bring the temps down from 110 or so to around 95. It helps but still not the most comfortable working environment. I'm kicking myself for not making the small investment in insulating the walls while the house was being built. Oh well. There is always the next house.