Well, the fact that the current windows don't seal is precisely why we
want new ones. No, we don't have or want a hermetically sealed house;
it's a 1930s creaky old house, with lots of drafts. We're just trying
to cut down on the drafts so we don't pay so much in heating bills and
the house can be more comfortable in winter. Also, we want to be able
to raise and lower our windows without a can of WD40.