More insulation?

Dear Tom,
I heat my home with electricity, even though I have a FHA furnace. Of course, at some point, the energy prices may reverse and I will use oil
Two years ago, I installed two inches of insulating boards on the outside of my foundation walls, down to grade. This helps keep cold out of the cellar andI am wondering if I installed the two inch board on the inside of the wall, would I get further protections. I only use my FHA furnace to keep temperature above 40F in the cellar and that is usually when temperatures go down to 0F.
Doug Hatfield
Houlton, ME

Hi Doug,
Yes, I think adding the additional insulation would be a good project. You are in a good place, in that the basement is already cool and there is2" on the exterior. The payback will be a little longer, but this is a much neglected area of the home, insulation-wise.
I would also suggest looking at the attic to see if you are up to snuff there. There should be a minimum of 12" of something fluffy up there, like cellulose or fiberglass.More is better.
Of course, you should also tighten window and door weather stripping, but I suspect if you are heating with electric and have already been astute enough to do thebasement on the exterior, you have a pretty good sense of what is important.
Tom