More specifically, should I insulate it now?
Recently, I was reading on Mr. Money Moustache, and he mentioned doing this:
For thirty dollars, he bought normal fiberglass insulation and duct-taped the paper backs to the inside of his garage door. Here is a kit that would do the same thing, but perhaps be easier:
Owens Corning Garage Door Insulation Kit-GD01 at The Home Depot
However, that is $75.95, and we would need a couple. I know that we are fond of styrofoam and its variations, so I prefer this kit:
Insulfoam Garage Door Insulation Kit-8 Ft Garage Door Kit at The Home Depot, which costs less, $57.73, but still much more than MMM said ($25 in one place and $30 in another).
Looking at the picture, it looks like the the insulation is narrower than the panels (going horizontally), so he would have taped in one, cut another in thirds (or so) and taped that in. It would take about three rolls of these:
Owens Corning EcoTouch Kraft 3-1/2 in. x 15 in. x 32 ft. R-13 Continuous Roll Insulation-RF10 at The Home Depot
For that price I could purchase 1.5 of these:
R-Tech 2 in. x 4 ft. x 8 ft. Foam Insulation-310891 at The Home Depot, which would be about 1/3 of enough.