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Couple question before I jump the gun.
How far is the garage from the main panel? You need to be mindful of voltage drop over vast distance between the two panels.
How big is your main panel? 200? If so, a 60 amp sub panel should be more then enough for the garage unless you have one of those monster garages and run all kinds of electrical items from it. Future HVAC plan or already in place?
Normally a #6 wire should do, depending on the distance. If its near 100' then I would suggest a 4 gauge wire
From your sub panel, run #12 for all your 120v plugs. Same wire for your 220 that goes to your compressor. Max draw is only 7.5A
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