How to winterize windows

How to winterize windows

Save money on your heating costs this winter

Winterizing windows in the fall often pays for itself with the first heating bill. Your home will be draft-free while saving money.

According the the U.S. Office of Energy Efficiency and Renewable Energy «Properly air sealing such cracks and openings in your home can significantly reduce heating and cooling costs, improve building durability, and create a healthier indoor environment».


Step 1

Clean the windows

Once the windows are weatherized, it will be hard to clean them and enjoy the outside view. Thoroughly clean them before installing any weatherization products.

Step 2

Seal around the windows

Look for any cracks or gaps between the window and the window frame. Fill any cracks or gaps with caulking. Follow the manufacturers recommended application guidelines.

Step 3

Check the weatherstripping

Weatherstripping provides the seal between and around moving window parts. With time and use weatherstripping wears out. Look for cracking, peeling, and missing weatherstripping.

Weatherstripping can be specific to a particular application. Select the proper weatherstripping for the application and follow the manufacturers instructions.

Find a guide to application and use of common weatherstripping at

Step 4

Install storm windows

Not everyone can afford new insulated windows. One option for insulating old windows are storm windows. There are many types of storms windows but all add additional R-value to windows.

Storm windows are made from a variety of materials and might be installed on the interior or exterior of the home. If you have storm windows, take them out of storage, check their condition, and repair if necessary before installing.

Learn more at

Step 5

Apply window film

If your windows are old or lack sufficient R-value, window film is an extremely cheap effective form of window insulation. A kit that treats 4 windows can be purchased for less than eleven dollars.

If installed properly, you’ll often forget it’s even there. Follow the manufactuers installation instructions for obtaining the best results.

Step 6

Install insulated curtains

Insulated curtains can significantly raise the R-value of your home windows and still allow the enjoyment of a scenic view during the day. Today there are many styles of insulating curtains and different degrees of R-value to choose from.

Step 7

U.S. government weatherization resource

The Federal Citizen Information Center in Pueblo, Colorado website has many more suggestions and ideas for home weatherization.

Things Needed
• time
• storm windows
• window film
• caulking
• weatherstripping
• insulated curtains
• hair dryer
• window cleaner
• clean cloths or newspaper

Tips & Warnings
• Most winter heat loss occurs through drafts and gaps around home windows.
• Weatherstripping and caulking must be applied at a specific temperature range.


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