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How to Stop Condensation on Windows

8th October 2023

Categories  Condensation/Damp/Latest News


How to Stop Condensation on Windows: Say Goodbye to Moisture Woes

Condensation on windows is a common issue that many homeowners face, especially during the colder months. It not only obstructs your view but can also lead to more significant problems, like mould and mildew growth or damage to window frames and sills. In this guide, we’ll explore what causes condensation, what condensation is, and, most importantly, how to effectively stop it. Plus, we’ll delve into mechanical ventilation options, such as humidistat-controlled extraction fans and Positive Input Ventilation (PIV) units, to combat condensation.

What Causes Condensation?

Condensation occurs when warm, moist air comes into contact with a cold surface, causing the moisture in the air to change from a vapor to tiny water droplets. This process is more likely to happen under certain conditions:

High Humidity: When the indoor air has a high moisture content, it increases the likelihood of condensation.

Low Temperatures: Cold surfaces, such as windows, provide the ideal conditions for condensation to form when they meet warm, humid air.

Inadequate Ventilation: Poor ventilation can trap moisture indoors, preventing it from dissipating and increasing the likelihood of condensation.

Single Glazing: Single-glazed windows are more prone to condensation than double or triple-glazed ones because they are colder.

What is Condensation?

Condensation is the process by which water vapor in the air turns into liquid water when it comes into contact with a cooler surface. It’s a natural occurrence and happens when warm, moist air encounters a surface with a lower temperature. While it’s a common occurrence, excessive condensation can lead to issues like mold growth, damage to building materials, and discomfort in your living space.

Now, let’s explore some effective strategies to stop condensation on windows.

How to Stop Condensation on Windows

  1. Improve Ventilation

One of the most effective ways to combat condensation is to improve ventilation in your home. Proper ventilation helps to circulate and replace moist air with drier air. Here are a few ways to achieve better ventilation:

Passive Ventilation: Use static air vents in areas prone to moisture, such as kitchens and bathrooms.

Open Windows: Regularly open windows, especially during the day when outdoor air is typically drier.

Mechanical Ventilation: Consider installing mechanical ventilation systems like humidistat-controlled extraction units or Positive Input Ventilation (PIV) units.


  1. Reduce Humidity Levels

Lowering the humidity levels in your home can help reduce condensation. Here are some tips to achieve this:

Use Dehumidifiers: Dehumidifiers can effectively remove excess moisture from the air, particularly in areas with high humidity.

Vent Dryer Outdoors: Ensure that your clothes dryer vents outdoors rather than indoors to prevent adding moisture to the indoor air.

Cover Cooking Pots: When cooking, cover pots and pans to reduce the release of steam into the air.


  1. Insulate Windows

Improving the insulation around your windows can help keep the interior glass surface warmer, reducing the likelihood of condensation. Consider:

Double or Triple Glazing: If you have single-glazed windows, upgrading to double or triple glazing can significantly reduce condensation.

Secondary Glazing: Installing secondary glazing, which involves adding an extra layer of glass to existing windows, can also improve insulation.


  1. Use Condensation Control Units

As mentioned earlier, mechanical ventilation options like humidistat-controlled extraction units and Positive Input Ventilation (PIV) units can be highly effective in controlling condensation.

Humidistat-Controlled Extraction Units: These units automatically detect humidity levels and extract excess moisture from the air. They are particularly useful in areas with consistently high humidity, such as bathrooms and kitchens.

Positive Input Ventilation (PIV) Units: PIV units introduce fresh, filtered air into your home, which helps dilute and replace moist air. They are particularly effective in older homes with inadequate ventilation.

For more information on condensation control units and how they can benefit your home, you can visit Proten Services’ Condensation Control Units page.


Condensation on windows can be a persistent nuisance, but with the right strategies and tools, you can effectively stop it in its tracks. Understanding the causes of condensation, such as high humidity and poor ventilation, is the first step toward finding a solution.

Improving ventilation, reducing humidity levels, insulating windows, and utilizing condensation control units like humidistat-controlled extraction units and Positive Input Ventilation (PIV) units can significantly reduce or even eliminate condensation issues in your home. By taking these steps, you can enjoy clearer windows and a healthier living environment.

If you need help with condensation please get in touch:

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