Which gaps are the most important to seal?

Which gaps are the most important to seal?

Air most often leaks into the house through the bottom of outside doors. A great place to start is sealing doors. For under $50 you should be able to get doors seals and weather strip tape to seal your worst external doors.

The same weather stripping used for doors can often be applied between the sash and frame of windows.  Gaps around the edges of the window can be sealed with caulk - a waterproof filler that is available from general hardware stores.

Sources of air leakage:

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