I live in an early-60's-build house. For the most part, it's wonderful, but it has very little insulation. I've been meaning to rectify that, but didn't yet. So, after spending a warm night buried under blankets, I wake up to a shivering-cold set of rooms, all under 60 degrees F.... even though me and the missus set all the baseboard heating to max and left both space heaters going. So, I decide to go to Walmart. I find two pallets of space heaters, one of them Infra-red, and one of them Oil-radiant. Both are electric. I go ahead and put...