Things You'll Need:
- Fiberglass insulation
- Putty knife
- All-weather caulk
- Caulking gun
- Molding-strip films
- Utility knife
- Weatherstripping
- Heat-shrink film kit
- Two-sided tape
- Hair dryer
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Step 1
Remove interior window trim and fill gaps around the window with fiberglass insulation. Stuff into gaps with a putty knife, being careful not to pack too tightly. Replace window trim.
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Step 2
Caulk around the exterior of the window with all-weather caulk. Remove any old caulking before adding new caulk.
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Step 3
Purchase molding-strip films from a hardware store. Cut to size with a utility knife by mitering the corners of each strip at 45-degree angles. Peel the paper from backs of the strip pieces and set them in place around the exterior of the window.
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Step 4
Add interior weatherstripping between the sash and frame to plug drafts from around a window. Use plastic, vinyl, felt or foam strips, and install per the manufacturer's instructions.
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Step 5
Use a heat-shrink film kit from at any hardware store. Clean the interior window trim and cut the film 2 inches larger than the window.
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Step 6
Place two-sided tape on the window trim, press the film into place and heat the film with a hair dryer set on high. Move the dryer back and forth about 1/4 inch from the film until the film shrinks and any creases and wrinkles vanish.
