Window condensation can happen in virtually any season of the year. The burning question is: Is Condensation on windows normal? Well, this largely depends on where you find window condensation. Or is the condensation or moisture on inside of windows or between the glass itself?

By first establishing where exactly the window condensation forms, you are one step closer to identifying what causes condensation on windows for your home. As a spoiler, the only really good kind of window condensation is the one on the outside of the window. Why is window condensation bad, otherwise?

In essence, window condensation occurs when the humidity in the air comes into contact with a cold surface. Now let’s talk about how window condensation takes place, depending on where it forms.

Condensation on the Outside of Windows

This happens when the air outside your home is humid and is warmer than your window glass. Therefore, exterior window condensation typically happens during the summer – a season wherein homeowners have their windows shut and their AC’s on. But why is window condensation good news in this scenario?

Outside window condensation means that your windows are doing a good job at sealing and insulating your home. Here’s why:

  • Outside humidity stays outside – which is why the condensation is formed outside
  • The glass is insulating very well since it is colder than the outside – meaning it is not transferring outside heat so easily
  • All in all, your AC doesn’t have to work extra hard because of your window’s ability to seal the home.

But apart from the good news mentioned above, we understand that you still want to wipe away external condensation to see the view outside. Wiping or cleaning is one way to get rid of external window condensation. The other way is to wait for the sun to point at the foggy window as this would clear up the condensation as well.

Condensation or Moisture on Inside of Windows

Window condensation is only bad when it’s on the interior side of the window or in between panes. So now, let’s discuss the first type of “bad” window condensation.

But before we proceed, take note that condensation or moisture on inside of windows is generally not bad if it is tied to the following events:

  • Steam coming from the shower
  • Excess steam coming from the kitchen with the ventilation hood turned off
  • Extensive use of a steam iron within a confined space
  • And other similar events.

However, if window condensation forms on the interior side of your window without any direct cause, it could mean that your home’s humidity is too high. Therefore, the moment that the glass becomes colder than your home’s temperature (e.g. during nighttime or during winter), the home’s humid air will then form condensation as it touches the interior side of the glass.

In the above scenario, the good news is that your windows are keeping your home sealed because after all, internal humidity cannot get out. The bad news is there could be a problem with your home’s ventilation system.

High internal humidity doesn’t just cause annoying window condensation, it can also lead to the following:

  • The formation or proliferation of mould or mildew
  • The increased presence of mould or mildew which can cause symptoms like respiratory irritation, skin irritation, and the like
  • Excess moisture in the home’s air contributes to the deterioration/swelling/rotting of wooden components as well as the corrosion of metallic components.

Whatever you decide for your home Valley Isle Windows & Doors is here to help! Contact us today