House Insulation

I was just reading another house blog that talked about the lack of insulation in the attic.  We had the same problem - we don't even have insulation in any of the exterior walls.  Our heating bills this winter have been quite high.  I insulated the attic with fiberglass rolls of R-30 in January.  I know that is not optimal for Minnesota, but I figured something was better than nothing.   Our Jan heating bill did come down a very little bit, but considering how cold January was - when the temperature was at -24 and and the house would not heat up beyond 62, . I'm glad I got the insulation put in!