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Why Do Your Windows Keep Fogging Up? Common Causes and Solutions

Published on: December 13, 2024

Window fog can prevent you from being able to see outside, which can greatly reduce your enjoyment of your home. A variety of causes can lead to window fog, including damaged or broken seals and extreme temperature differences between inside and outside. 

Learn how to resolve the issue and prevent foggy windows to improve your home’s enjoyment.

Problems with Foggy Windows

Foggy windows can cause various problems. These include:

  • Obscures views outside
  • Prevents natural light from entering your home, leaving it dim and cool
  • Reduces the window’s energy efficiency if it is caused by a broken seal
  • Can lead to the window frames rotting due to moisture buildup between the panes

For these reasons, you should not simply ignore your foggy windows. Review what’s happening to learn the main cause of your window issues. 

Evaluating Your Window Fog Problem

The first step in solving your window fog problem is to evaluate where the fog is located. Fog can be on the window’s exterior, interior or between the glass panes. 

You might see interior glass fog when the temperature inside your home is cooler than it is outside. This happens when your AC is running but it is hot outside.

In contrast, you’ll see exterior window fog when your home is warmer than the outside air temperature. This happens more commonly in the winter months when you run your heater. 

Condensation on the inside and outside of your home’s windows is not cause for concern because it is due to environmental changes and likely resolves as the day goes on or when the weather changes. 

If the fog is between your glass panes, you might have an insulation problem with your windows due to a broken or damaged seal. 

What is a Broken or Damaged Seal in Double-pane Windows?

Double-pane windows include two pieces of glass with inert gas between them. To prevent fog from building between the panes, manufacturers place a seal between the panes. The manufacturing process works well at handling various weather events.

In the summer, the double panes keep your cooled air inside your home. And in the winter, the panes retain your heat-treated air.

But as your windows age, the seals can wear out, which allows condensation to form between the panes. Once your seals are broken, you should start exploring window replacement options.

Solutions for Foggy Windows

You have many options for how to solve your foggy window dilemma. The solution will directly relate to the cause of the problem. Here’s what you can do to solve your foggy window problem.

1. Use a Dehumidifier for Inside Condensation

When your windows have interior condensation, it could be a sign that your interior humidity is too high. To resolve this, run a dehumidifier to get your home back to its optimal humidity levels and reduce your window fog. This is most helpful during the summer months when humidity levels are high.

2. Replace the Window Seals

A window repair specialist can help you replace your window’s seals to help elongate the life of your windows. At times, they might recommend replacing the interior glass pane during the process. However, the process is complex and costly. By the time you pay to repair the window, it’s often more cost-effective to replace the window because you’ll get upgraded energy efficiency that also helps you save on your energy bills.

3. Apply Defogging Spray

Defogging spray is also preventative. Coat your window’s glass in the spray to help prevent temperature changes from causing inside or outside fog. This does not provide protection in case of broken or damaged seals.

If you don’t want to buy a special material, you can also coat the window in shaving cream. Regardless of what you use, you’ll need to reapply it every few weeks.

4. Look Into Your Window’s Warranty

If your window is under warranty, you might be able to file a claim and get the window replaced. Depending on the warranty details, you might still have to pay for the labor involved in replacing the window. Some window installers also warranty the installation, but read the language carefully because it likely only covers faulty installation and not reinstallation in case of faulty windows.

Allow the Professionals to Do It

Tips for Preventing Window Fog

The greatest window fog prevention comes from installing high-quality windows and replacing them before they reach the end of their life. The installation work is just as important as the window itself. DIY window installation can lead to serious challenges down the road. So while you might save thousands of dollars with DIY installation to start, it can be far costlier in the long run. 

Installing windows yourself might mean you don’t get the manufacturer’s warranty on the window. It also might mean you damage your home’s walls in the process, leading to costly repairs. 

Additionally, you can prevent fog related to temperature and humidity by doing the following.

  • Keep doors open to maintain consistent temperatures throughout your home
  • Ventilate your laundry area to prevent humidity build-up that can cause your windows to fog
  • Use lids on your pots and pans when cooking to avoid additional inside humidity
  • Ventilate the home from time to time by opening your windows
  • Ensure your home has good insulation in the attic and closets especially
  • Review your fireplace for proper ventilation
  • Run the bathroom exhaust fans during a shower
  • Update the weatherstripping on your exterior doors
  • Protect your home from excessive moisture with updated gutters

Why You Should Contact 2FL Windows, Siding and Roofing for a Window Assessment

It might feel like you’re guessing about what’s wrong with your home’s windows. But it doesn’t need to be that way. Work with the team of experts in the greater Seattle area who know window installation unlike anyone else. 

2FL Windows, Siding and Roofing patented the Rain Jacket Flashing System to provide the greatest protection for homes, businesses and multi-family complexes. Using the method, we can install windows that surpass AAMA window pressure tests for hurricane-force wind-driven rain. The method helps us avoid replacing siding at the same time as windows but still get the best seal.

When working with 2FL, you’ll also get:

  • Financing options through Hearth so you can get new windows with low monthly payments over the next several years
  • Vetted products and manufacturers you can trust
  • Commitment to customer service
  • Free estimate to talk you through your options for window replacement
  • Licensed, bonded and insured
  • Listed on the Best of HomeAdvisor 2021
  • Featured Pro on Porch
  • Best of Houzz 2020
  • Super Service Award recipient for Angie’s 2020
  • Accredited with the Better Business Bureau

Schedule your free estimate now to start enjoying your windows again and getting more natural light inside your home.

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