What Are the Signs Your Window Seal Is Failing?

There are several possible culprits behind a spike in your monthly power bill. One of them is a failing window. Renewal by Andersen® of Sacramento, your go-to contractor for patio doors, lists the signs you need to keep an eye out for. 

Glass Distortions 

Manufacturers fill the space between glass panes with argon to slow down the transfer of heat. The window’s sealing prevents the argon from leaking out. If the sealing is damaged, argon starts to leak out and may cause parts of the window glass to collapse or even break. 

Sometimes, however, there’s only a slight distortion that’s barely noticeable. One way to check for slight distortions is to check your reflection. Compare your reflection on the window glass with your reflection in a mirror. 


Moisture can enter the gaps in the sealing and form condensation between the glass panes. Even with a broken seal, condensation may not form. What you can do to check for leaks is to rub an ice cube on a window. If you the weather sealing is damaged, foggy patches will appear between the window panes. Just make sure to wipe down both sides of the window first. 


If you notice some parts of your house are colder than others, there may be a draft coming in from your window. If you’re not sure, you can use the incense trick. Close all the openings in your home and light an incense stick. The incense should start to flow towards the window leak, if there are any. 

The drafts could also be coming from other parts of your home. Doors that aren’t a great fit for your house can let in drafts. If the drafts are coming in from your doors, consider replacing them with a new style, like sliding french doors

How to Deal With Failing Window Seals

Replacing leaky windows is more cost-effective than repairing them. Repairs can plug the leaks in the sealing, but the argon gas that leaked out can’t be replaced. Replacing the window pane is the only way to restore a window’s energy-efficiency. However, a new insulated glass unit costs as much as a new window. 

Looking for a window replacement? Renewal by Andersen of Sacramento offers a wide variety of windows and doors, including hinged french doors. To schedule a free consultation, call us at (916) 226-3359 or leave us a message on this form. We serve homeowners in Roseville, CA.