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How to Tell If Your Windows Are Costing You Money on Energy Bills

June 23, 2025 · Expert Exteriors · Window Installation

Northern VA homeowner paying high energy bill concept

The numbers don’t lie: up to 30% of heating and cooling energy in residences can be attributed to windows that allow heat to escape or pervade the home, according to the U.S. Department of Energy. If your windows aren’t doing what they should, you may lose energy (and money) every month. This article discusses some of the top signs that identify the need for a new window replacement in your home.

Drafts and Air Leaks

If you can feel a breeze near your windows even when closed, you likely have an air leak. These leaks let conditioned air escape while letting outdoor air in, forcing your HVAC system to work harder to maintain a stable temperature. Over time, this added strain increases energy use and utility bills.

Hold a tissue or lit candle close to the window edges to check for drafts on a windy day. If the tissue shifts or the flame wavers, an air leak in the window is likely letting energy escape.

Rising Utility Bills

An unexplained increase in energy costs is one of the most common red flags that your home needs new windows. If your heating or cooling usage hasn’t changed but your bills have gone up, you should investigate whether your windows are contributing to the problem. According to ENERGY STAR, upgrading to their certified windows can help reduce the energy expenses of a home by roughly 12% across the country.

Condensation Between Panes

Moisture trapped between the panes of a double- or triple-pane window is usually a sign that the seal is no longer intact. That failure lets insulating gas (like argon or krypton) escape, reducing the ability of the window to maintain temperature and prevent heat transfer. As a result, the demand on your HVAC system causes it to work less efficiently and your energy costs rise.

Temperature Fluctuations

Are certain rooms always too hot in the summer or too cold in the winter? Inconsistent indoor temperatures can be caused by windows that no longer insulate your home correctly. Older windows or those with deteriorating weatherstripping or poor seals may allow outdoor temperatures to affect indoor comfort.

Single-Pane Windows

white brick wall with gable roof and single-pane window

If your house is still equipped with single-pane windows, replacing them should be high on your to-do list. Single-pane glass provides minimal insulation compared to modern double- or triple-pane designs.

Newer options feature insulated frames and advanced coatings that trap heat in the winter and prevent heat entry in the summer. This can significantly impact both your indoor comfort and your monthly energy costs.

Difficulty Opening or Closing Windows

Difficult-to-operate windows may suffer from frame warping, faulty components, or balance problems. These issues often signal structural damage that compromises the window’s seal. Even minor gaps around the sash can allow air to escape or enter, reducing the energy efficiency of your home.

Noticeable Noise from Outside

If outside noise seems louder than it should, your windows are likely letting in more than just sound. While this isn’t a direct energy concern, it often indicates that windows aren’t sealing properly. Better insulated windows reduce energy loss and offer better soundproofing.

Why Energy-Efficient Windows Make a Difference

Choosing new windows should be based on more than the aesthetics. The right windows can have a measurable impact on the energy performance of your home. ENERGY STAR-certified windows use low-emissivity (low-e) coatings, multiple panes of glass, and gas fills to slow heat transfer. They help maintain indoor comfort year-round while reducing the demands on your HVAC system.

Be sure to ask your window installer if any local programs or rebates are available for upgrading to energy-efficient windows as part of your installation. 

When It’s Time for Window Replacement

If you’ve experienced any of the above issues, you should consider replacing your windows. A professional window replacement offers long-term benefits:

  • Reduced heating and cooling costs
  • Improved indoor comfort
  • Lower carbon footprint
  • Better home value
  • Less outside noise

Modern window options are designed to provide lasting durability, fast service with minimal disruption, and performance that pays off over time.

Book Our Window Installation Experts

Northern VA window installer sealing window

If the windows in your home are raising your energy bills or making your home less comfortable, Expert Exteriors can help. Our experienced team offers high-quality window replacement with speed and accuracy. From your first consultation to the final cleanup, we work efficiently, often completing projects within a week or two of signing the contract.

Proudly serving homeowners in Northern Virginia and Maryland, we make communication easy with a direct line to the team managing your project. Every installation is completed with thorough cleanup and careful attention to detail, all at a competitive price.

To learn more about how we can help you improve the energy efficiency of your home, contact Expert Exteriors online or call (301) 298-8386.

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