Sealing doors is an easy trick for reducing energy loss in your home. Requiring minimum tools and materials, a door seal runs along the bottom of your door to cover any gaps. Especially popular in older homes, a door sweep (shown here) requires screws to stay in place. Thresholds are another popular option to reduce air flow under the door. Gaskets, self-adhesive silicone, and foam are options to seal the tops of doors.
Position the seal so that its bristles just touch and bend on the floor. Use an awl to mark where fasteners are needed (Image 1).
Screw the seal to the door (Image 2). Move the door back and forth to check that the seal is positioned correctly, before securing the final screws.
Sealing Front Doors
Front doors can be a major source of drafts, especially if your home does not have a porch. Ensure that in addition to sealing gaps around the edges of the door, you seal any openings or gaps and caulk any cracks in the trim.