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I've had a Modine Hot Dawg in each shop, they are excellent. Scale to your size and plenty of btus. Thats the issue with a mini split, usually they arent enough btus for a large shop. Open the door once one a cold day and you are cold again for too long. Great for efficiency and if you arent putting swapping cars in a moderate space.
But, you really need to air seal and insulate. Anything you do will lower your heating costs and increase comfort.
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