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Cracks, Gaps and Locks: How to Pinpoint Window Leaks

Higher utility bills are expected in summer, but some homeowners are surprised by how much their cooling costs increase. Now, there are a variety of reasons for a higher-than-expected power bill, but there’s one thing homeowners sometimes fail to check—their windows.

Cracks, Gaps and Locks How to Pinpoint Window Leaks

Cool air may have been leaking out and warm air may have been rushing in your home through the leaks in your windows. Renewal by Andersen® of Oklahoma, your go-to company in the state for french doors, shows you how to check for leaks below.

The Incense Air Pressure Trick

Make sure all possible openings that air may pass through are shut, including windows, doors, air vents and dampers. Light an incense stick in front of your window and doors; the direction of the incense should pinpoint the source of the leak.

Pinpointing Gaps

If there is a leak, the next step is to find its source. Big enough gaps and cracks in the window should be easy to spot. If not, pointing a flashlight towards the window at night should reveal the gaps and cracks.

If there’s still no visible gap, gently shake the frame or try opening and closing the windows in quick succession. See if the locks are secure and listen for a rattling noise. Cool air may be leaking out of the gaps created by locks that won’t close properly. If, however, there’s a rattling noise instead, the gaps may be located around the insecure frame.

For doors, see if there are any cracks. Make sure the hinges are screwed tight and the door is just the right fit.

Keep in mind that these same gaps can also be the source of water leaks that may worsen the damage to your window. As such, before the onset of sudden summer thunderstorms or rains, it’s best to plug them.

If your window’s still under warranty, contact the manufacturer right away. If, however, the warranty no longer covers it, it might be better to get a replacement window. The gaps mean your windows are no longer as energy-efficient as they used to be. And over the long term, it may end up costing you more in power costs and potential moisture damage.

Renewal by Andersen of Oklahoma offers a wide variety of energy-efficient windows and doors as well as window and door replacement services. To learn more about our premium products, call us at (405) 212-5936 or fill out this form. We serve homeowners in Oklahoma City (OKC) and Tulsa.


"Our new windows are absolutely wonderful! We were pleased with the entire process and the product and would recommend Renewal by Andersen to anyone."

Mike & Kathy, Edmond| OK
November 5

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