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What Causes Condensation on Windows & How Do I Stop It?

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Window condensation is a common issue that many homeowners encounter. It can appear in various forms, and understanding the underlying causes is essential for addressing the problem effectively. In this blog post, we will explore the reasons behind condensation on windows, including the good and bad forms of condensation. By the end of this article, you will have a better understanding of why condensation occurs and what steps you can take to prevent or resolve it.

Good Form of Condensation

Condensation on windows can take on a good form, which indicates that your windows are doing their job correctly. This type of condensation typically manifests as water droplets on the interior or exterior of the glass. When you can touch these droplets, it suggests a significant temperature difference between the inside and outside of your home.

For instance, if it’s a scorching 90 degrees outside, and you have your air conditioner set to a cool 60 degrees, you may notice water droplets forming on the window’s surface. This is a positive sign, as it means your insulated glass unit is effectively preventing the transfer of heat, maintaining a comfortable temperature indoors. In essence, this form of condensation indicates that your windows are working as intended.

Bad Form of Condensation

On the flip side, condensation can also take on a bad form, which signifies potential issues with your windows. This type of condensation occurs between the panes of glass and cannot be touched or wiped away. When you observe condensation between the glass panes, it’s a clear indicator of a seal failure.

A seal failure means that the barrier separating the interior and exterior of your window has been compromised. This allows moisture to penetrate the space between the panes. The presence of condensation in this area may also indicate a loss of argon or krypton gas, which is used for insulation within the glass unit.

Identifying the Cause

Now that we’ve distinguished between the good and bad forms of condensation, let’s explore what causes each.

Good Form Causes

  • Temperature Differential: As mentioned earlier, a significant difference in temperature between the inside and outside of your home can lead to condensation. This occurs when warm, moist air inside meets cooler window surfaces.

Bad Form Causes

  • Seal Failure: The primary cause of bad form condensation is a damaged or compromised window seal. This allows moisture to seep into the space between the glass panes.
  • Gas Loss: If you notice condensation between the panes, it may also indicate a loss of argon or krypton gas, which reduces the window’s insulating properties.
  • Ventilation Issues: Sometimes, condensation problems can be exacerbated by poor ventilation in your home. Restricted airflow can trap moisture and lead to more condensation on windows.

Addressing Condensation Issues

To address condensation on your windows, consider these practical steps:

  1. Improve Ventilation: Ensure proper airflow in your home by using exhaust fans, opening windows, or installing a ventilation system.
  2. Seal Repairs: If you suspect a seal failure, contact a professional to assess and repair the issue.
  3. Window Replacement: In severe cases, where seals cannot be repaired, you may need to replace the affected windows.
  4. Moisture Control: Use dehumidifiers to reduce indoor humidity levels, especially during humid seasons.


In conclusion, understanding the causes of condensation on windows, both good and bad forms, is crucial for maintaining a comfortable and energy-efficient home. When you observe condensation, it’s essential to identify the root cause and take appropriate action.

If you’re unsure or need assistance, don’t hesitate to contact us for professional advice and solutions to your condensation problems.

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