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I have a 1500 sf detached garage that is fully insulated and drywalled. I have a 220v window unit stuck in a wall and it cools the garage in a half hour. I only use it when I go out there so cost is unnoticeable.
If you spend lots of time in the garage - then go with a dedicated attic unit.
If you occasionally go in the garage - then a window unit is perfect.
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Randy
'87 911 Targa
'17 Macan GTS
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