sealing the gap tightly once the window is closed. Most foam weather stripping has one sticky side so it can be adhered to the fixed portion of the window without sticking to the moving one.

Don't let your windows let the cold air in—or the warm air out. Here's how to detect, fix, and prevent drafty windows.

Re-caulking your windows and doors can also keep the cold air out. Plus, don't forget to cover your pipes. Blazak said foam ...