There are many small jobs that can collectively have a significant impact on the exfiltration and infiltration of outside air. Several are common maintenance projects, such as caulking around exterior window and door frames and weather-stripping operable sash windows. Other penetrations through the building shell are not so apparent. These include convenience outlets and switches in exterior walls, junction boxes, and other appurtenances in ceilings adjacent to attic space. It is also important to repair all penetrations in partition walls that front storage or mechanical rooms and other unconditioned spaces.
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Excerpt from Energy Conservation Projects.