There's a lot of excellent input here so here's a contribution I have....
I am so grateful my garage faces NORTH - so it's shaded in the front of it where I like to work on stuff.
I'm in Florida where shade does matter!
I've been to other folk's homes where the sun beats down into their garage and it's literally hell to work in.
Your situation in Michigan may require a different tack but either way orientation of the house (and garage) is very important.
And don't forget to plan for trees for shade!
