Condensation on windows – it’s one of those things that just seems to happen, right? Whether you’ve just installed new windows or are dealing with the old ones, it’s likely you’ll find yourself wiping down those droplets on the glass. But did you know that not all condensation is a bad sign? In fact, condensation can sometimes indicate that your windows are doing their job effectively. However, if it’s left unchecked, it could also point to underlying issues that require attention. 

In this blog, we’ll be taking a look at the causes of condensation, explaining when it’s a sign of effective insulation and when it may indicate a problem. We’ll also provide some easy peasy tips on how to prevent and manage condensation on your windows at home. 

Why does condensation appear on windows? 

Let’s have a quick science lesson – don’t worry, there won’t be any homework! Condensation forms when moisture in the air settles on a surface that is cooler than the air around it. This happens when warm, moist air comes into contact with a colder surface, like your windows. With the increasing use of double-glazed windows, which are sealed tightly to prevent heat loss, moisture now has nowhere to escape. As a result, it settles on the glass, causing condensation.  

While this is a normal occurrence, it’s important to understand that there are different types of condensation – internal, external, and between the panes – and each may require a different solution. 

What are the different types of window condensation? 

Internal condensation 

One of the most common causes of condensation is internal moisture buildup.  

What causes internal condensation? 

In homes without proper airflow, the moisture from activities like showering, cooking and even breathing accumulates in the air. If your home doesn’t have enough ventilation, it can’t escape, and as the air cools down, it condenses on the coldest surfaces, like your windows. In the colder months, this can result in a constant battle with moisture that seems to appear no matter how much you try to wipe it away. 

How can you fix internal condensation? 

Use dehumidifiers: A dehumidifier can solve about 80% of condensation problems. It works by removing excess moisture from the air, helping to keep your indoor environment dry. While they may not be the most stylish appliances, they are highly effective at reducing moisture. 

Ventilate properly: The ultimate trick to avoiding internal condensation is good airflow. Open windows, use exhaust fans, and avoid keeping the house too airtight. Ventilating during cooking, showering, and drying clothes indoors can really reduce condensation buildup. 

Avoid drying clothes indoors: When you dry clothes indoors, you’re adding a large amount of moisture to the air. Whenever possible, try to dry clothes outside or in a well-ventilated area to cut down on indoor humidity. 

Condensation between the glass 

You may notice condensation appearing between the glass panes of your double-glazed windows. This is not normal and is a sign that the window seal has failed. 

What causes condensation between the glass? 

The space between the two panes of glass in a double-glazed window is filled with a gas (like argon) to improve insulation. If the seal around the window unit breaks, moisture can enter the gap between the panes, causing condensation. This typically happens over time, as seals can deteriorate due to age, extreme temperatures, or poor installation. 

How can you fix condensation between the glass? 

Unfortunately, once condensation appears between the panes, the window unit will need to be replaced or resealed by a professional. In the meantime, if this is happening to your windows, it’s a good idea to get them checked by a specialist to prevent any further damage. 

Condensation on the outside of windows 

While condensation on the inside of windows can be frustrating, condensation on the outside of windows is perfectly normal – and even a sign that your new windows are working well! 

Why is there condensation on the outside of my windows? 

When the air outside is warmer than the surface of your double-glazing, condensation forms on the outer surface of the window. This usually occurs during colder months when the outdoor temperature drops significantly. It’s a good thing because it means your windows are effectively insulating your home and keeping all that toasty warm air inside. 

What can you do about condensation on new windows? 

It’s common for homeowners to worry when they see condensation on their new windows. However, this doesn’t mean there’s a fault with the installation, it’s more likely you need take a few simple steps: 

Open the trickle vents 

New windows often come with trickle vents, small openings at the top of the frame that allow air to circulate. These vents help prevent moisture buildup inside the window. Simply open them to allow a small flow of air to reduce condensation. Our friendly team will be happy to explain how to use trickle vents when we install your new windows, so please don’t be afraid to ask! 

Open the windows occasionally 

While you don’t want to open your windows on a rainy day, letting in fresh air every now and then can help reduce indoor humidity and prevent condensation. 

Invest in a dehumidifier 

If the problem persists, a dehumidifier will help to pull moisture from the air inside your home. It’s especially useful if you’ve had recent renovations alongside your new windows, like plastering, which can introduce extra moisture into your home. 

 

Got more questions or would like to talk about new windows for your home? Contact our friendly team today, we’d love to help!