I have found that leaving all the shop doors closed with a floor based large fan is the way to go. I would much rather circulate the air already inside than let the draft pull 98 degree air in. I can notice a 12-15 degree temp drop if I am outside then walk inside. morning or late evening is fine to open the big doors. 3,100 sq ft spray foamed with no air conditioning.

My building where I work has a 2400 sq ft shop, there is a 12 ft Big ass fan. It pushes a lot of air, but it's just circuiting hot air since it's near the ceiling. It's great if it's not that hot out and you want a little breeze. Useless in the summer if you ask me. Much better keeping all the doors shut with a floor fan.