Radiant flooring is one thing that crossed my mind when building my shop but I didn't follow up on it. Fortunately I'm in North TX and its only cold a few months out of the year that I would use it. I've got full HVAC in the shop and even though I can keep the shop nice and toasty it still gets COLD laying on the concrete crawling under cars. I feel for you guys up north...I just couldn't do it! Thing to consider with radiant flooring is that heat rises so an efficient radiant flooring system will help heat your shop as well.
I can't see a cheap way to do it that would be worth while. To get a good system in there that would actually work I'm sure you are cutting out concrete... time to move!
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