Working in the summer heat

One of the downsides of my new home workshop is that it has no ventilation, unless I open the garage door. Although this is usually not a problem, I keep seeing little chipmunks scampering across the door opening, and have an occasional visiting wasp. I use a wall mounted fan to get some air flow, which helps a little. I'd love to start work by 7AM to take advantage of the early morning coolness, but I'm in a cul-de-sac of a condo, and 8AM is about the earliest I can start.

If any of you have dealt with a similar situation and have come up with some solutions, I'd love to hear them. Meanwhile, it's still better than working in air conditioned comfort in a noisy shop with poorly maintained tools.