# Hidden gaps in your home could be increasing your electricity bills How small air leaks are sabotaging your energy savings - **Source:** [Trendir](https://brifing.si/source/fa0937ee-5bfe-4107-bbbb-30be072b2212) - **Published:** 2026-07-27 - **Topic:** [Business](https://brifing.si/c/business) - **Original article:** - **On Brifing:** https://brifing.si/s/98f3287d-e915-4e67-8950-9a8256eea99d ## Invisible energy losses Small gaps around windows and doors in homes cause unnoticed air leaks. According to Virginia Cooperative Extension, a pair of front doors without proper weatherstripping can have about a 6mm gap where they meet. This gap equates to a 130 cm² hole to the outside. The U.S. Department of Energy lists window and door edges as one of the top spots for air leaks in typical homes. When combined, these small gaps can cause energy loss equivalent to running your heater with a window open all winter. ## Impact on energy costs The ENERGY STAR program states homeowners can save an average of 15% on heating and cooling bills by sealing air leaks and adding insulation. The Department of Energy says weatherstripping windows and doors alone can reduce total energy bills by up to 10%. For a $200 winter gas bill or $300 summer electric bill, this translates to significant monthly savings. Importantly, these improvements often pay for themselves in less than a year. ## Why they go unnoticed There are two main reasons air leaks go undetected. First, air moves through small gaps in slow, sideways currents that are only noticeable when it's very cold or hot outside. Second, your house constantly pulls in air without you realizing it. When bathroom fans, dryers, or range hoods operate, the house draws replacement air through the easiest available path - usually around doors and windows. These leaks force your HVAC system to work harder and longer. ## Detecting leaks method The U.S. Department of Energy recommends a simple, free method to detect air leaks using just an incense stick or small candle and about 45 minutes. On a cold or windy day, after closing all openings and turning on exhaust fans, slowly move the incense around window and door edges. Watch for places where the smoke suddenly bends or gets pulled toward the frame - these indicate leaks. This test typically takes less than an hour for a small house. ## Common leak locations The most frequent leak spots are typically the top corners of window sashes, the lock side of front doors, and the bottom edges of exterior doors. These gaps often exist in places homeowners would swear are airtight. In older homes especially, deteriorated door and window seals can cause significant energy losses. During testing, each leak found can be marked with temporary painter's tape for later repair. ## Choosing the right insulation The appropriate sealing material depends on the gap type. The Department of Energy warns against using one material for everything. V-strip weatherstripping (tension seal) works best for window sashes - it's thin, self-adhesive, and springs open when windows close. For door frames, adhesive foam tape or rubber compression strips are recommended, with foam handling uneven gaps well and rubber being more durable for frequently used doors. ## Affordable and effective solutions Sealing air leaks doesn't require expensive renovations. Appropriate weatherstripping materials typically cost just a few dollars. For example, V-strip for windows sells for a few dollars per roll, while foam tapes or rubber seals for doors are similarly priced. These simple measures significantly reduce energy bills while improving home comfort. In older homes especially, these small improvements can make a substantial difference. ## Long-term benefits Sealing air leaks provides benefits beyond energy savings, including improved home comfort. It creates more consistent indoor temperatures, eliminates drafts, and makes HVAC systems work more efficiently. ENERGY STAR notes these improvements also reduce carbon footprints. Regular inspection and replacement of weatherstripping ensures continued energy savings over time, making it one of the most cost-effective home maintenance tasks. ## Sources covering this story - https://www.trendir.com/warning-hidden-gaps-in-your-home-could-be-driving-up-your-electricity-bills/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._