How to Stop Window Condensation: Causes, Prevention, and Solutions

window and door repair service

difference between condensation and blown window panes

Window Condensation


Window condensation occurs when warm, moist air comes into contact with a colder surface, causing the moisture in the air to turn into liquid water. It typically forms on the interior side of windows during cold weather when the indoor air is warmer and more humid than the outdoor air.

Window and door repair service

Blown panes

Blown window panes, also known as blown seals or failed seals, refer to a situation where the seal between the panes of a double- or triple-pane window fails, allowing air to enter the space between the panes. This can happen due to various reasons such as age, poor installation, or manufacturing defects.

What causes window condensation?

Window condensation is primarily caused by a temperature difference between the inside and outside of a building, coupled with relative humidity levels indoors. When warm, moist air comes into contact with a colder surface, such as a window pane, the moisture in the air condenses into water droplets. Here’s a breakdown of the factors contributing to condensation on windows:

Temperature Difference

During cold weather, the temperature inside a building is typically warmer than the temperature outside. When this warm indoor air comes into contact with the colder surface of a window pane, it cools down. As it cools, its ability to hold moisture decreases, leading to condensation on the window.

Window Condensation

Poor Ventilation

Inadequate ventilation can exacerbate condensation issues. When indoor air becomes trapped inside a building without proper ventilation, moisture levels can rise, increasing the likelihood of condensation on windows and other cold surfaces.

Window Condensation

Activities Generating Moisture

Certain activities within a building, such as cooking, showering, or drying clothes indoors, can release moisture into the air. If these activities are not adequately ventilated, they can contribute to higher indoor humidity levels and increased condensation on windows.

Window Condensation

Type of Window

The type of window and its insulation properties can also influence condensation. Single-pane windows tend to have more condensation issues compared to double-pane or triple-pane windows, which provide better insulation and reduce the likelihood of condensation by maintaining a warmer interior glass surface.

Window Condensation

According to the NHS website, moulds produce allergens and toxic substances that when inhaled or touched can cause “allergic reaction, such as sneezing, a runny nose, red eyes and skin rash.

“Moulds can also cause asthma attacks.”

Window Condensation Health risks!

Condensation itself doesn’t pose direct health risks, but it can create conditions that contribute to other issues that may affect health. Excessive condensation on windows or other surfaces can create a damp environment conducive to mold and mildew growth. Mold spores can exacerbate respiratory problems, trigger allergies, and cause other health issues, particularly in individuals with asthma or other respiratory conditions.

How to Stop Window Condensation!

To effectively reduce or eliminate condensation on windows, you can employ several strategies:

  1. Improve Ventilation:

    • Increase airflow throughout your home by opening windows or using exhaust fans in areas where moisture tends to accumulate, such as kitchens, bathrooms, and laundry rooms.
    • Use ceiling fans to circulate air, which helps prevent moisture buildup by promoting evaporation.
  2. Use Dehumidifiers:

    • Install and use a dehumidifier to remove excess moisture from the air, especially in areas with high humidity levels or where condensation is a recurring issue.
    • Place dehumidifiers strategically in problem areas to target specific areas of moisture buildup.
  3. Monitor Indoor Humidity:

    • Invest in a hygrometer to monitor indoor humidity levels regularly. Aim to maintain indoor humidity levels between 30% and 50% to minimize condensation while avoiding excessively dry conditions.
    • Adjust your heating, ventilation, and air conditioning (HVAC) system settings to regulate indoor humidity levels as needed.
  4. Seal Windows and Doors:

    • Check for and repair any gaps, cracks, or leaks around windows and doors that may allow warm, moist air to enter your home from the outside.
    • Apply weather stripping or caulking as necessary to improve the sealing of windows and doors and prevent air infiltration.
  5. Insulate Windows:

    • Upgrade to double-pane or triple-pane windows, which provide better insulation and help maintain warmer interior glass surfaces, reducing the likelihood of condensation.
    • Consider installing storm windows or adding window insulation film to improve energy efficiency and reduce heat transfer.
  6. Use Insulating Window Treatments:

    • Install thermal curtains, cellular shades, or window quilts to add an additional layer of insulation and reduce heat loss through windows, which can help prevent condensation by maintaining warmer window surfaces.
  7. Increase Surface Temperature:

    • Use radiant heaters or other localized heating sources near windows to increase the surface temperature of the glass, reducing the temperature differential between the indoor air and the window surface and minimizing condensation.
  8. Remove Excess Moisture Sources:

    • Address sources of excess moisture within your home, such as leaky plumbing, dripping faucets, or water seepage from the foundation or roof, to reduce overall humidity levels and minimize condensation.

By implementing these strategies, you can effectively reduce condensation on windows and create a more comfortable and healthy indoor environment. However, it’s essential to assess your specific situation and needs to determine which combination of methods will be most effective in addressing condensation issues in your home.

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