Did you know up to 30% of your home’s heating energy is lost through poorly-maintained windows? Inadequate insulation and gaps and cracks in the frames are key culprits of energy loss.
Fortunately, simple exterior window maintenance strategies can improve energy efficiency and save you up to $583 annually. For example, if you caulk your windows, apply insulation film, and reconsider window screens, you can successfully seal air leaks and keep out drafts, as well as extend the lifespan of your windows.
Caulk your windows
Caulking your exterior windows seals air leaks and results in energy savings between 10-20%, the U.S. Department of Energy reveals. So, use a caulk gun to apply caulk in any cracks and gaps around the exterior of your windows — particularly along where the window frame joins the siding or wall.
Always remove loose, old caulk with a putty knife first and clean the area before you apply fresh caulk. Then, apply the caulk in a smooth, continuous line to form a complete seal. It’s also important to choose a caulk suitable for exterior use — this is so it’s able to withstand various weather conditions. Ideally, check the caulk once a year, and replace it once it starts to peel, crack, or fall off.
Apply insulation film
Insulation film is a thin layer of plastic applied to the windows that can prevent heat loss and save around 5-10% of your home’s energy bill. It’s easy to DIY, with kits available that require you to use a hairdryer to bond the film to the window. Insulation film is also shatter-proof, which means the glass won’t shatter into dangerous shards if your windows break.
However, if you live in a location prone to high winds and hurricanes, film likely won’t be enough protection. In this case, upgrade to impact windows, which can typically withstand 200 mile-per-hour winds These windows consist of two layers of glass with a special liner in between that absorbs impact and prevents shattering in hurricane-force winds.
Take down window screens for winter
Window screens primarily function to protect windows from dirt, bugs, and debris — but they also somewhat block sunlight and warmth from your interiors. This potentially means you spend more to heat your home in the colder months. Ideally, remove your window screens in the winter to maximize the amount of natural light and heat provided.
This also successfully prevents the accumulation of snow, ice, and moisture between the window and screen, which can damage your windows and frames in the long run. You can then pop the screens back up in the summer, and therefore keep windows open for ventilation during warmer weather and also easily keep bugs at bay.
Upgrade to Energy-Efficient Window Treatments
Beyond caulking and insulation film, choosing the right window treatments can enhance energy efficiency year-round. Thermal curtains, cellular shades, and insulated blinds help trap heat during winter and block excessive sunlight in summer, reducing strain on your HVAC system.
- Thermal Curtains: Made with multiple layers of fabric, these curtains create an extra barrier against heat loss. For maximum effectiveness, ensure they fully cover the window and reach the floor.
- Cellular Shades: Designed with honeycomb-shaped cells, they trap air and provide insulation, lowering energy loss by up to 40% in winter and 60% in summer.
- Insulated Blinds: Unlike standard blinds, insulated options have reflective or foam-backed materials that help regulate indoor temperature.
Pairing these treatments with existing maintenance efforts, such as caulking and insulation film, can significantly improve home energy efficiency while enhancing comfort.
Inspect and Maintain Window Weatherstripping
Weatherstripping is a simple yet effective way to seal air leaks and prevent energy loss. Over time, exposure to weather conditions can cause it to crack, shrink, or become loose, reducing its effectiveness.
How to Maintain Weatherstripping:
- Check for Damage: Look for worn-out or peeling weatherstripping around the edges of windows.
- Replace if Needed: Remove old weatherstripping and install new adhesive-backed foam, rubber, or silicone strips. Ensure they press tightly against the window frame for a snug fit.
- Use a Draft Test: On a windy day, hold a lit candle near the window frame—if the flame flickers, there’s an air leak that needs sealing.
By keeping weatherstripping in good shape, you can cut energy waste and prevent drafts from making your home uncomfortable.
Upgrade Old Windows with Energy-Efficient Options
If your windows are outdated or constantly need repairs, consider upgrading to energy-efficient models. Modern options like double-pane or Low-E (low-emissivity) windows help reduce heat transfer and block UV rays, resulting in lower energy bills.
Energy-Efficient Window Options:
- Double or Triple-Pane Windows: These windows contain insulating gas (like argon or krypton) between panes, reducing heat loss.
- Low-E Glass Coating: A special microscopic coating reflects infrared light, keeping warmth inside during winter and blocking heat in summer.
- ENERGY STAR® Certified Windows: These meet strict efficiency standards, helping homeowners save up to 12% annually on heating and cooling costs.
Although upgrading windows is an investment, it can significantly improve insulation, reduce noise pollution, and increase home value in the long run.
Routine exterior window maintenance is essential to prolong the lifespan of your windows and improve energy efficiency. If you caulk your windows, improve insulation, and reconsider window screens, you can successfully prevent air leaks and keep your windows in great condition for longer.
