I have a horizontal screen sliders on my garage door and since our laundry is in the garage, we found it best to keep the garage door open and the screens closed is cooler than the garage door closed. For a few years I cracked the attic steps opening about 6" and I could feel a steady breeze in the garage by the opening and the garage felt better overall.
However, I have since kept the attic steps opening shut for the last couple of years for two reasons. Termites will usually die quickly in temperatures above 100 degrees, I don't want to give them a place to breed. In a masonry home the wooden trusses are my biggest concern and leaving the attic access open creates a greater chance of any fire in the garage spreading quickly.
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