Another thing.
I'm also planning on adding a glazed door to one of the two garage doors so that on a sunny winter day I can open the garage door and use the entire doorway for passive solar gain.
It's this idea:
Solar Workshop or Studio
I would do one of the two doors so that I could still actually get a car in and out of the garage. We have two cars. I could park one in the driveway, or, I think that with the extra space in the garage that I could pull in through the one door and still maneuver to the next space over. We would just park the more fuel-efficient car in the handy space, so that car was always the first one used.