> [air] from the outside That's probably the only thing from your list that you are likely to find in a 100 yr old house that hasn't been recently renovated.

> [air] from the outside That's probably the only thing from your list that you are likely to find in a 100 yr old house that hasn't been recently renovated. And that is a result of the far less precise building and sealing methods from that time, and not that fresh air was a design goal of the old house. Those old houses tended to leak water and air like sieves, resulting in very high energy consumption and lower comfort. On the plus side, the materials they were probably built with (solid wood) were far more tolerant of moisture than today's synthetic building materials (OSB, etc), and with all the air leakage that occurred, they dried out quickly. That's why many of these old houses' structures have lasted, while newer, tightly sealed houses with moisture penetration have failed. Also the air leaks provided fresh air. > ... water-tight construction Not only is this not likely to be the case on an old house, without a modern mechanical forced ventilation system installed, a water-tight house (with the windows shut) incompatible with the requirement for "[air] from the outside".