I live in Minnesota and while I suspected my attached garage was not insulated I just now got around to actually checking. The builder sheetrocked the attached garage without insulating first. There is no insulation in the attic/ceiling, either. Question: Is it worth it to tear the sheetrock off and insulate (ie. is it going to make that much of a difference in heating/cooling bills)?
Most sites I have found emphasize the importance of having an attached garage insulated.