Shop upgrades.

You're going to love it when you get it done. Insulating my shop was one of the best things I've ever done. A tip from experience, put in more lighting and more outlets that you think you will need. It's tough to go back in to add them later and costs almost nothing to put them in ahead of time.

I have 6" thick insulated walls and skinned the lower with 1/2" plywood. The upper walls and ceiling were skinned in some kind of white Tyvek looking stuff that really brightened up the place once the LED lights went in. It was a lot of work and about $4000 all told but worth every penny.