At third house garage facing northwest, screen lowered temp about 5 degrees. It was only noticeable if we opened the lanai doors, and back door we got about 10 degrees difference if there was a steady wind.
This house garage faces due south, and without a screen, both doors open, we cool about 4 degrees. Instead of investing in a $3500. Screen for this house we are installing a mini split. Then can control temp that makes difference
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Do not worry about things you can not change 
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