Just to point out that Africa might be hot in areas, but ball pythons also tend to live underground, so are not out in heat without being able to get away from it by going into underground burrows.
I think that moving them inside or doing something to lower the temps would be best.
Are they sitting up high? Is it lower in temp nearer the floor? Would a fan lower the temps? Is there any sort of AC that can be used in the garage?
Me personally, I'd move them inside. But I tried to think of any possibilities for you.
Wolfy