Looking for coffee table size, or desk or side table sizes. Something like 24x24 and 24x48. I live in Grayslake, shop is in Wauconda. Not too far from Kenosha. Two of my employees live in Wisconsin as well, Bristol and Elkhorn, so they could always pick up if you wanted.
Before you do anything heating or cooling wise I would put insulated doors on the garage. At a minimum you could do one of those DIY garage door insulated kits or make your own. You will be shocked at what a difference it makes.