My garage is heated and air-conditioned and it's the best thing ever! I also put in a floor drain and hot and cold water, so that all winter I can wash my cars in seventy degree comfort. I highly recommend it. I did mine with a 1.5 ton heat pump. Sounds expensive, but the whole set-up cost me about $1,800. Actually, the 1.5 ton is way overkill for my 20x50 garage. You should be able to buy a smaller heat pump and still heat your space for much cheaper.
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