You will get a million different opinions on this - my thinking is anything you can to do improve airflow will help in the garage. I am not so worried about the area above the house (attic???) 'cause I have nothing stored up there. I am sure it is hot as Hades and hoping the roof vents are handling what they can. I do have Christmas items stored in the garage and an extra fridge that I couldn't live without and still haven't seen an electric bill over $130. I remember $225+ where I moved from and was still hot so I'm not complaining.
We do have a window we try to keep open and the garage door is 1/4 open when we are home.
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