Seal the savings: 5 DIY tips to insulate windows and lower your power bill

As the days grow shorter and the temperatures start to dip, now is the perfect time to get your home ready for the winter. While cozy sweaters and hot cocoa might be top of mind, your windows deserve a little attention, too. After all, a well-sealed home doesn’t just seal in your comfort—it seals in your home’s energy and helps you save money.

According to the U.S. Department of Energy, as much as 30% of your home’s heat can escape through windows. The good news? With a little time and elbow grease, Virginians can save up to 10% annually on power bills by just sealing and insulating windows. What’s even better is that it doesn’t take a big budget or a professional contractor to safeguard your home against sneaky
drafts and leaks. So before the first cold snap rolls in, get ahead of the chill (and high power bills)—a quick weekend project now can mean months of comfort and savings later.

Here are five easy, affordable ways to insulate your windows and seal in the savings this winter:

1. Caulk around the sash and frame

   Caulk is your best friend when it comes to filling the small cracks and gaps that act as fast-pass lanes for drafts. It’s inexpensive, easy to apply with a caulk gun, and provides a long-lasting seal—just make sure the surface is clean and dry before you apply.

   

2. Install weatherstripping on movable parts

   For windows you still want to open, weatherstripping is a great solution. The flexible strips make it easy to operate windows while providing a seal that prevents cold air from creeping in and your home’s heat from sneaking out. They come in a variety of materials, like foam, rubber, and felt, so you can choose the one that best fits your windows.

3. Apply window film

   This plastic shrink film looks simple, but it could be your secret weapon when it comes to stopping drafts at the source. Apply it to the interior frame and use a hair dryer to shrink it tight. This transparent layer of insulation isn’t permanent, but it can make a noticeable difference in your comfort and on your power bill.

   

4. Add draft stoppers

   Draft stoppers are the simplest, low-tech fix of the bunch. Pick some up at the hardware store, or make your own from rolled-up fabric to block the cold air from slipping in at the base of windows and doors. These are particularly handy for older homes or apartments where gaps between openings are bigger and leaks are more obvious.

5. Hang thermal curtains or storm treatments

   Heavy or thermal curtains keep heat in during the day and reduce heat loss during the night. For an extra boost, if your budget allows, consider adding storm treatments. They add an extra layer of protection without having to replace your current windows.

   

If upfront costs are a concern or DIY isn’t your thing, don’t worry. The Weatherization Assistance Program can help qualified households with both materials and installation. You can even explore other incentives and rebates that help make energy-efficient upgrades more affordable.

Keep in mind that sealing and insulating isn’t a one-and-done project. Caulk and weatherstripping can dry out or shrink over time, so be sure to check them every season. Don’t forget to check around outlets and exhaust fans—drafts love to sneak in where you least expect them. To learn more about how to stay comfortable through every season while saving big on energy, visit ValueYourPower.org.