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Step 1. Using a sharp utility knife, cut the paint seal that runs along the sash stop boards and the window jambs. Then carefully push a flat pry bar under the stops and pry them off. Pull the nails from the backside of these trim boards.

Step 2. Pull the bottom sash away from the window opening, and remove the cords or chains that are connected to the sash weights. Set the bottom sash aside, and pry away the parting strips that separate the top and bottom sash from the grooves in the side jambs.

Step 3. Remove the sash weights, cords, and pulleys from the side jambs; then enlarge the pulley opening using a drill and a sharp spade bit Using a piece of scrap cardboard and a cup, pour loose-fill insulation into the weight cavities.

Step 4. Carefully measure the jamb opening, and cut the new jamb liners to fit, using a hacksaw or a power miter box. Then attach them to the old jambs following the directions that came with the kit. In many cases, you simply screw the liners to the jambs.