Just a little insulation goes a long, long way

As I noted a while back, when we ripped the drywall down in the family room we took the opportunity to stuff in some rudimentary insulation, just 2" Styrofoam sheeting tossed in there. Today, with the outdoor temperatures being in the teens, I noticed that the surface temperatures of the insulated vs. uninsulated portions of the wall were noticeably different - probably a 10 degree differential.

Now I kind of wish we'd ripped more drywall down so we could insulate more. If we had the time, resources, and weather cooperation, ripping all the drywall down, both walls and ceiling, and putting good insulation in would have been terrific.