My experience is that it does help, but it won't lower it, it helps keep it from heating up more. I have an East facing metal door with windows. I use my garage building models and painting them so I have to control both the temperature and the humidity in that space. I started this winter by doing the insulated panels in the doors and it does make a difference, as an earlier poster mentioned about 6-8* different. Later I tinted the windows in the garage. Finally, this past week I added a split AC so I should be ready for the summer heat. In theory anyway... regarding the solar attic fans, I use the attic for storage and while I am not sure it will do much to cool the space it will move more air and help to moderate the space. I have other experienced neighbors that don't use their attic for storage but instead put a screen where the cover used to be to help promote airflow. I put a ladder in my space.
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