One might start out by getting your attic insulated as this would help to keep the garage cooler in the summer months. A mini-split is always an additional option but it would be only if you plan on using your garage like an additional room for the house and don't plan on raising/lowering the garage door. Last factor might be which way your door would be facing. If you get evening sun on the door the mini-split would be working extra hard to cool the space.
Good luck
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