That can help, but the real problem starts somewhere on the outside. Older homes often used boards for sheathing that offer little protection from air flow. Do you know what is inside the walls for insulation? Dense packed cellulose does a good job of reducing unwanted air leakage.
Do you have a basement or crawlspace where you can access the perimeter of the structure where it sits on that foundation. Pictures or a description could help.
Bud
Do you have a basement or crawlspace where you can access the perimeter of the structure where it sits on that foundation. Pictures or a description could help.
Bud
