Dude, I live in Michigan. I went from a Volt (that's with a Veeeee, like Victor) to a Bolt (with a beeeeeee, like Bravo) a month ago. That's the exact convo I had with the tint shop today, by the way.
Apparently the Volt windows had some factory tint all the way around, because I am roasting, like a rotisserie chicken, in the sun. It's like my feet and right hand are frozen, but my left arm is on fire when I drive.
I'm opting for some ceramic tint. I have an appointment mid September in Grand Rapids to get it done.
Anyone who had it done, let is all know how the IR and heat reduction was.