If a proper seal is not formed around any outside doors, air will leak resulting in lost energy. Periodically inspect the weatherstripping around around any doors leading to outside. Hold your hand near the edges or doors to feel for air movement. Another method, which is even better, is to light a stick of incense and hold it near the edge of the door. If the smoke does not rise straight up, there is an air leak.
Replace any damaged weatherstripping. Extra weatherstripping may be required to create a good seal.
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