Air sealing involves closing up the cracks and holes between the inside and the outside of the home, which eliminates the drafts that so often are the source of a homeowner’s discomfort. It’s a crucial step in any project where insulation is involved, and because of this, we usually target areas like a home’s attic, flooring, and basement or crawl space. Air sealing helps ensure that the air you want in your home—cool air in the summer and warm air in the winter—stays in your home.