Do windows create condensation?

The short answer is, no. Windows themselves do not cause condensation, however, they can be a common location where condensation forms. Condensation occurs when warm, moist air comes into contact with a cooler surface which then can cause moisture in the air to condensation into liquid droplets. 

Windows can be particularly susceptible to condensation due to their exposure to both indoor and outdoor temperature variations. When the surface of a window is cooler than the air inside a room, and there is high humidity or moisture in the air, condensation can form on the window surface.


Some common factors that contribute to window condensation include: 

  1. Excessive indoor humidity: High humidity levels indoors can increase the likelihood of condensation on windows
  2. Poor ventilation: inadequate ventilation can lead to the accumulation of moisture in a room, which then increases the chances of condensation on windows. Without the proper airflow, the humid air cannot escape which allows moisture to build up
  3. Temperature differentials: Cold outdoor temperatures and warm indoor temperatures can create a significant temperature difference across one window. When warm, moist indoor air comes into contact with a cold window surface, condensation can occur

Where do I see the condensation?

Condensation is on the outer side of the glass

If the condensation occurs on the outside, it's usually a good sign. Outdoor condensation is common during the summer due to the high humidity and very little wind. Condensation shows up on the outside because it shows that your home is keeping warm air out while keeping cool air in.

Condensation is on the inner side of the glass

If condensation appears inside, there is too much humidity in the house. Indoor condensation usually appears during the winter, especially at the start of the cold winter months, as the outdoor temperature drops rapidly, and the indoor surfaces cool down. The cooler the outdoor air, the more likely condensation is to occur indoors.

To prevent condensation with aluminum multipoint fenestration, you can follow these steps: 

Proper Ventilation

Ventilation is a great way to reduce and/or control indoor humidity. Without air circulation, we can expect to see condensation appear on large glass surfaces. This does not mean a window defect, but simply that there is not enough air reaching the glass surface. As a temporary solution, you can also open a window to allow moist air to escape and dry air to return.

Humidity Levels

Do you have the right humidity level based on the outside temperature?

To reduce the duration of condensation, one must be able to control indoor humidity. Humidity levels can be monitored with hygrostats or “humidistats”

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