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When the finished trim and door weather stripping is added on the side wall jambs, you lose about 2 1/4 inches in width.

Locking them pulls the sash tight against the weather stripping.

Look for drafts or anyplace air is leaking in and use weather stripping to insulate it.

Small home improvement projects, such as adding or replacing weather stripping that seals leaks around doors and windows, can significantly reduce your energy consumption, Hicks says.

You should also repair rips in your screens, replace weather stripping and check around electrical conduits to ensure your home is as tightly sealed as possible.