The Husbear got home from work early today and pulled more of the downstairs bedroom apart. He pulled the Sheetrock from the wall, and under that was (mostly) old tongue-and-groove boarding that had been wallpapered over many times in the past. At some point in the past, there must have been some damage of some sort, as a large section had been replaced with apparently whatever they could find at the time. Pulling off some of the boards to check out what the insulation was like, we discovered there was no insulation in the walls at all! That would explain why it was so cold in that room last winter. We just thought it was because the ghosts stay in that room!