If not insulating the attic over the garage (a non living space) I would assume the wall between the garage and the house would be insulated. Do you know if that is a fact?
If the wall between the house and the garage is NOT insulated, there may be some benefit realized by insulating the garage ceiling.
Bottom line.....If you don't insulate the garage ceiling, (most contractors do not) it seems to me that insulating the wall between the garage and the house would be beneficial. Perhaps, more beneficial then insulating the the garage ceiling.
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