Doing laundry in the garage in the middle of summer is not a pleasant experience. I've been there, done that, and it's one of the reasons we sold that house and bought another.
Even if you were to not consider the unpleasant weather conditions in the garage, something else to keep in mind is you never hear the dryer buzzer. You either have to keep running out there to check, or it stops and your clothes sit there and get wrinkled.
My opinion, having had both options, is to have an inside laundry.
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