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What's Causing The Condensation On My Windows?

A very common problem you may have noticed with your windows is the build-up of condensation between the panes. While it could be a naturally occurring phenomenon, it could also be a sign of something more severe. Condensation is the most common on days where the outside air is colder than the interior air. This is why condensation usually occurs in the fall and winter opposed to the warmer parts of the year. The reason behind this is because windows usually have the coldest surface on the exterior of the home. Moisture can even be found on window frames and fixtures. So the question is... is condensation a bad sign for you windows? The answer is a bit more complicated than you might think.


Seal Failure vs. Normal Condensation


There is a difference between basic condensation and the seal of your window failing. Interior condensation is common and caused by the humidity inside your home during the winter months. It is especially typical when the temperature outside is low and the moisture levels are too high. This is a normal occurrence and is not a sign of something more severe such a seal failure. This form of condensation happens when too much moisture is trapped in the home. It is actually a good sign, because it means that your window is insulating the home efficiently.


If you find moisture between the panes of glass, this could be indicative of a potential seal failure. This is a very bad sign and could lead to some costly repairs if left untreated. The way that this works is that your window has a gas between the panes of glass to insulate the window. If the seal of your window has been broken, then this gas will have leaked out. Air then gets trapped between the panes and causes condensation. Over time this condensation will slowly erode and/or warp the window frame. It can even do damage to the frame of the home in severe cases! Not only is this an issue, but without the insulating gas your home will be a lot more sensitive to outside temperature fluctuations. This means you are spending more money on heating and cooling your home over the course of time.


How To Combat Window Condensation:


If you're having issues with interior condensation, and are positive that it is not the result of a broken seal, then we've made a list of what you can do to prevent the condensation from occurring. Keep in mind that if the condensation is permanent (it doesn't come and go in cycles during the day) than the windows need to be replaced. If you are unsure you can always Find An Expert to take a look and give you their professional opinion.


  1. Use a moisture eliminator such as a dehumidifier

  2. Use fans every time you cook,take a hot bath or shower

  3. Ventilate your rooms by running ceiling fans

  4. Open a door to increase air flow in an out of the home

  5. Look into window replacement options

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