How to Winterize Double Pane Windows

Examine the caulk on the outside of the window and identify any areas that have cracks or have separated from the frame. Scrape off all of the old caulk using a caulk tool.

Insert a tube of exterior grade caulk into a caulk gun and cut off 1/4 inch from the tip of the nozzle using scissors.

Apply a 1/4-inch wide bead of caulk along any visible cracks and then smooth them out using your finger. You may want to create a continuous bead around the entire widow just to be safe. Repeat the process on the inside of the window frame as well.

Go back inside the home and open the window. Measure the base of the window using a tape measure and then cut a piece of foam weatherstripping to the same length. Peel off the adhesive backing and press it to the bottom of the window. Close the window, compressing the foam as you do so.

Place storm windows over the exterior of each window for added protection. Align the storm windows so that the fins are along the window frame completely covering the glass. Insert 1-inch wood screws through the screw holes on the fins to secure it in place. If this is the first time you have installed storm windows, you may need to pre-drill the holes in the window frame first.