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A friend with a 24 x 28 attached garage simply tapped onto his house hvac. The house is on a crawl space and he went through the lower garage wall into the crawl space on two sides (back wall and one side wall that were both common to the house). He installed standard AC vents with 8" flex ducting and tapped into existing duct lines in the crawl space. No return - just the two vents. The garage and door are insulated. It works great winter and summer and is in a humid climate. Very simple to do if you have an attached garage.
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