How to Save Energy on Windows and Doors

Caulk and seal around windows and doors to stop drafts.

Windows and doors often leak. That's the simple facts. But, it is fairly easy to make repairs to minimize or eliminate those leaks, which will result in energy savings, as well as a more comfortable home environment.
Inspecting your windows and doors:
If your home is fairly new, your windows and doors are less likely to leak than if your home is older. However, depending on particular practices followed during construction, even new homes can have leaky windows and doors.
Look closely at where the window and door frames meet the siding. Are there any open gaps where outside air and elements could enter the home?

If so, you will need the following, available at most home centers and hardware stores.
o Exterior caulking -- get one that is recommended for windows and doors; and if you plan to paint it, be sure it is the type that is paintable.
o Caulking gun -- get one that feels like it won't fall apart the first time you put pressure on the handle.
o Small putty knife
o Retractable razor-knife
o Damp cloth

Start by removing any existing loose or failing caulking, using a retractable razor-knife or putty knife. Then, trim tip and pierce new caulking tube and place into caulking gun. Place caulking gun over the gap or joint between the window or door frame and the house siding, and gently but steadily pull on the caulking gun handle to apply an even, smooth bead of caulking around the perimeter of the window or door and within the gap. Include below the window-sill or door threshold, if accessible.

Smooth the caulking with the small putty knife so it fills the gap and is flush with the two sides of the gap. The bead does not need to protrude, and is probably best if it doesn't.

To finish, wipe the newly sealed joint very gently with the damp cloth, taking care not to pull any of the fresh caulking from the gap.