Can Weatherstripping Windows Help Cut Energy Bills?

As cooler weather arrives, homeowners should start preparing for colder temperatures, damp conditions, and strong winds that can drive up heating bills and force furnaces to work harder than needed. While fall is often considered the ideal time to have siding checked before winter, weatherstripping windows is another important project for reducing energy costs.

Beyond a basic HVAC inspection and tune-up, sealing air leaks with weatherstripping is a simple upgrade that can make a meaningful difference in home energy efficiency. It helps keep warm air inside and cold air outside, which allows heating systems to operate more efficiently. It also reduces drafts, a major source of heat loss in many homes. Depending on the condition of the windows and doors, weatherstripping can lower energy costs by about 5% to 30%.

What to know about weatherstripping your windows

There are several ways to weatherstrip windows and help block extreme temperatures. For a fast DIY fix, self-adhesive foam tape can be used to cushion and seal the gap between the window sash and the frame. It helps stop air leaks when the window is closed and is a good option for renters or homeowners who want an affordable, nonpermanent way to improve efficiency quickly.

For a more durable solution with greater potential savings, V-strip, also called tension seal weatherstripping, can be installed. Made of metal or vinyl, it creates a spring-like seal in the tracks where the window slides, forming a tighter and longer-lasting barrier against cold air. This can be a manageable DIY project for more experienced homeowners, but those who are unsure may want to hire a home energy or window professional. For the best chance of reducing energy costs significantly, all doors and windows should be weatherstripped to build a more complete air barrier around the home.