re: Anyone convert attached garage into living space?

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you can do anything. Whether it works depends on the size of your garage and the size of the unit you are pulling air from.

have an hvac guy come take a look

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This. I would think the average garage is at least 400 sq. ft. and that is a lot to heat and cool in addition to your actual living area. Like already mentioned, split unit or window unit is the way to go-----that way, if not in use you can simply turn it off and save on electricity.

I have an 850 sq. ft. man cave on my first floor that is not in use every day, so the window A/C or heat is only used when actually down there doing something. It is so well insulated that it only takes about 1/2 hour to heat or cool.