Why Do My Windows Have Condensation On Them?

Have you noticed the windows in your home becoming fogged up or dripping with moisture? Window condensation is a common phenomenon, especially during the winter months.

However, it can be a signal that something is wrong with the windows in your home.

Continuing reading to learn why your windows have condensation on them and what you can do about it.

Why Do My Windows Have Condensation On Them

What is Window Condensation?

Window condensation occurs when humidity and cool temperatures combine, making it common during the winter season.


If an object is significantly cooler than the air around it, water molecules in the air will essentially stick to its surface to form a thin layer of moisture—this is what happens to a glass of cold water in the summer. Windows often have condensation due to the fact they are usually the coldest surface in your home when outdoor temperatures are low.


While window condensation is not always a cause for alarm, it could signal problems with your windows that should be remedied.

Exterior Condensation

Condensation on the outside of your windows is a surprisingly good sign. This occurs when the air outside is warmer than the glass on your window—particularly common in areas with high humidity.


Exterior condensation is a sign that your windows are not allowing any heat transfer to occur, meaning they are properly insulating your home. While the condensation may interrupt your outside view, it just means your windows are doing their job well.

Interior Condensation

If you notice condensation forming on the inside of your windows, it’s important to pay close attention. While this may be the result of steam from your shower or stove, it could indicate high humidity levels in your home due to a ventilation issue.

This excess moisture can potentially cause significant damage to your home and your family’s health. Without proper ventilation, the water vapour will collect inside carpets, furniture, and walls. This makes your home the perfect environment for mould and mildew, which can induce severe allergic reactions. Over time, the moisture will also cause your home to deteriorate as the wood softens and metal rots.

It’s vital that you take action right away if you notice interior condensation. Luckily, there are a few things you can do.

How to Reduce Window Condensation

To reduce the condensation on your windows there are a few steps you can take, including:

  • Buying a dehumidifier
  • Turning up the heat inside
  • Moving plants away from windows
  • Using your bathroom fan
  • Opening your windows

If you see no change after using these tips, it may be time to replace the windows in your home. Vinyl windows are an excellent choice due to their contoured finish and superior insulative properties.

For professional help reducing the condensation on your windows, contact Euroseal today and give your home the quality window technology it needs.