I live in an house that was built in the early 1900s. One of the bedrooms has a wall with windows. The entire wall always feels cold and a breeze seems to pass thru. Underneath the windows the paint has peeled and the plaster is mostly destroyed. The previous owners covered up the section underneath the window with wood wall panel. Now the wall panel is bowing and just about to come out. Also the paint on the base board and on the window trim are peeling. What can I do about the cold that is coming from the outside? I have found some gaps along the trim of the window but the entire plaster beneath the window is bad. Can I add insulation? Should I tear down that portion of the wall or the entire wall (the rest of the wall just has minimal cracks but is still cold)?