Save Energy by Winterizing Windows

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November 22, 2005

Windows can account for as much as 35 to 40 percent of a home's heat loss. With heating costs on the rise, that can translate into significant dollars. New windows are not in everyone's budget, so if you are looking to increase the energy efficiency of existing windows, here are some simple tips for sizable energy savings.


Locating the Leaks

The first step in improving the energy performance of your windows is to locate the air leaks. For the best results, perform this on a cold and windy day. Turn on all exhaust fans, the furnace and the clothes dryer. This will increase the difference in pressure, drawing air out of the house so that outside air is drawn in to replace it through leaky points. To locate air leaks, hold a smoking stick of incense or a thin piece of thread near windows. Drafts will be apparent as the tread or smoke move with the air currents. Assess if there is any weatherstripping or whether it is worn out and needs to be replaced. Mark the area with chalk. Now that you know where the leaks are, you can fix the problem.

Weather Stripping

As a rule, weatherstripping should be installed at points where surfaces move or slide together. The type of window will determine the type of weatherstripping to use.


Double Hung or Vertically Sliding Windows: These types of windows can be weather-stripped with tubular strip materials. Install weatherstripping in the gaps between the window sash and frame. This also includes the area in the middle on where the two sashes meet.

Someone Weatherize Windows


Horizontal Sliders (and sliding glass doors): The type of weatherstripping to use on these windows depends on the material the sash is made from. If not previously weatherstripped, wood or vinyl-covered windows can be fitted with angled strip materials. If factory installed stripping is worn out or defective, replace it with the same type of stripping it came with.

Awning, hopper or casement windows that swing open: Weatherstrip these windows like you would a door. Attach stripping to the jamb (on all sides, including hinged side) so the window closes against it.



Caulking is another method of improving performance that gives a high return on energy savings for a minimal amount of investment. It should be used on the non-moving parts of windows. The best place to caulk is on the inside. Although exterior caulking is important for weatherproofing, it has little effect on overall energy savings. Apply caulk where the frame of the window meets the wall and between the frame and sash (on permanent non-sliding sections).

Replacing Sashes & Reglazing

Replacing sashes or reglazing windows can be cost effective alternatives to replacing entire windows. Select sash material with a high insulating value and glazings with a low emissive coating.

Plastic Film

It's nobody's favorite, but plastic film can be a good short-term solution to poor performing windows-especially traditional storm windows. Installed on the outside, it helps reduce air infiltration. The negative side of this is that it may frost over, reducing visibility and creating moisture problems. If placed on the inside, it can help stop heat through leaky windows. The other side of this is that the glue can damage stain or paint once removed.


A Cautionary Note About Combustion Air

Whatever steps you take to increase your window's energy performance by stopping air leaks, it's important to make sure that your furnace, water heater, and other fuel-burning appliances have sufficient combustion air. It they do not, backdrafting of carbon monoxide and other gases into the home can occur. For more information on Combustion Air, how to test for problems and how to install a combustion air supply, consult with your local utility company or energy expert.

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