Sorry, I do not understand what you are trying to do. If you are trying to keep the garage a little cooler, keep the door to the house closed and use the screened garage door, I am assuming this is a large screen over the garage door opening. If you leave the door to the house open, you are using your A/C to cool the garage AND your attic.
If I have misunderstood, please clarify.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV.
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