Condensation on windows is a common wintertime problem, particularly in homes with double glazing. Left unchecked, it can lead to problems with mould and can cause serious damage to your property.
We explore why condensation forms on double-glazed windows, practical steps to stop it, and what to do if it’s already an issue.
Having problems with condensation can be frustrating and feel like it takes a lot of time to resolve – but with a few simple steps, you can keep your windows dry and your home warm, all while maintaining a good level of energy efficiency.
What causes condensation on windows in the winter?
Condensation forms when moist air hits a cold surface. Double-glazed windows, particularly during the colder months, can attract this moisture. Winter often makes the problem worse because of the sharp contrast between indoor and outdoor temperatures.
The main factors that cause condensation on your windows include:
Poor ventilation
Poor ventilation causes a lack of airflow, which raises humidity levels and leads to condensation on windows. Without proper circulation, moisture from daily activities like cooking and showering builds up, settling on cooler surface – to prevent this, it’s important to keep rooms well-ventilated by opening windows or using extractor fans, allowing damp air to escape and reducing condensation.
Temperature differences
When the inside of your home is warm, but the windows remain cold, moisture in the air condenses on the cool glass. This happens because warm air holds more moisture, and when it comes into contact with the cold surface of the window, the air cools rapidly. As it cools, the moisture it carries turns into liquid, creating condensation. This is especially common in winter when the temperature difference between the inside and outside of your home is greater.
Excess humidity
Daily activities like drying clothes indoors can add to higher levels of humidity, which can settle on windows.
If you notice frequent condensation on your double-glazing during winter, it’s worth identifying the main culprit to deal with it quickly and effectively.
What to do if your double glazing has condensation on the outside?
Condensation on the outside of double-glazed windows might seem worrying, but it’s actually a sign that your windows are doing their job. This occurs when the outside temperature is colder than the surface of the glass, and while it may get in the way of your view temporarily, it isn’t harmful.
Here’s what you can do if you’re experiencing this:
- Be patient: This type of condensation will typically evaporate as the sun warms the windows.
- Improve outdoor airflow: Make sure bushes or objects near the windows aren’t preventing airflow, as this can help moisture dissipate more quickly.
Outside condensation is a small inconvenience but usually resolves itself without much intervention and is a reassurance that the windows are working.
What to do if your double glazing has condensation on the inside?
Condensation forming on the inside of your windows is more of an issue. It can lead to mould, dampness, and poor air quality in your home.
Luckily, there are several ways you can treat this:
Increase ventilation
Open your windows when possible, especially after activities that may create extra heat or moisture in the home. Using extractor fans in kitchens and bathrooms can also help to reduce this problem.
Use a dehumidifier
Dehumidifiers can help to reduce the amount of moisture in the air, which in turn stops condensation from forming on windows.
Try to keep a consistent temperature
Instead of letting rooms get cold and then heating them up suddenly, try to keep a steady indoor temperature, which helps to reduce the build- up of condensation.
Use moisture absorbers
Affordable moisture absorbers, silica gel packs or mini dehumidifiers can be placed on windowsills to soak up excess moisture.
For more information on how to handle condensation inside your conservatory, take a look at our Managing condensation guide.
What to do if double glazing has condensation in between the window glass?
Condensation trapped between the panes of double-glazed windows can be more worrying, as it shows that the window seals have failed, and the insulation has been compromised.
Once this happens, the window will no longer work efficiently, and unfortunately, it can’t be fixed very easily.
In this instance, the best steps to take are:
Seal repair: In some cases, it may be possible to repair the seal, although this isn’t always a long-term fix.
Window replacement: If condensation between the panes happens a lot and doesn’t seem to go away by using other methods, then replacing the affected windows might be necessary. Although this is more expensive, it ensures the best energy efficiency and prevents future problems.
Tips for preventing condensation on double-glazed windows
Prevention is always better than cure, especially when it comes to condensation. Try these tips to reduce or stop condensation forming on your windows:
Improving home ventilation
Good airflow is really important to help control the moisture levels found indoors. There are many ways you can improve the ventilation in your home:
Open windows regularly
Even in winter, opening windows for short periods can help reduce moisture build-up.
Install trickle vents
If your windows aren’t already kitted out with them, trickle vents are a great way of providing a small, constant flow of air into your home without losing too much of the house’s heat.
Use extractor fans
In kitchens and bathrooms, extractor fans are great for removing moist air straight away when it is produced. Make sure these are working properly.
For more on keeping your home warm while ventilating, visit our post on how to heat a conservatory.
Maintaining consistent temperatures
Sudden temperature drops can create condensation, so keeping your home at a steady, comfortable temperature can help. You can use smart thermostats to regulate your heating more efficiently and monitor the usage in your property.
Insulating your conservatory roof
If you have a conservatory, you’re likely to notice that it can become very cold in the winter.
One of the best ways to manage this is by insulating your conservatory roof. Insulation not only keeps your conservatory warm but also stops condensation build-up by keeping the internal temperature at a steady rate.
An insulated conservatory helps regulate temperature, reducing the need for excessive heating and cooling. Keeping this stable indoor climate can help lower energy use from heaters and air conditioning units, giving a more energy-efficient and eco-friendly home.
Alongside these benefits, insulation minimises the risk of condensation by preventing cold surfaces where moisture can gather, making your conservatory more comfortable and usable year-round.
Fitting insulation like CosyPanels is straightforward and can be completed by fitters quickly. Most insulation processes are completed within a day. This means you can start enjoying the benefits of an insulated conservatory without long disruptions to your daily routine.
The cost of conservatory insulation can vary depending on the size of your space and the type of materials you choose. Getting a customised quote helps you understand these costs better and estimate long-term savings.
Though it requires an upfront investment, the savings on energy bills and added property value often make it worthwhile. CosyPanels provides detailed quotes and guides you through the process step by step.
With conservatory insulation, you can enjoy better energy efficiency, reduced noise, and year-round comfort.
To learn more about the benefits of conservatory insulation, see our detailed guide on roof insulation.
Cleaning and maintenance tips to stop condensation
Keeping your windows clean and keeping up with regular maintenance is an important process in reducing condensation. Dirt and grime can affect the seals and performance of your double glazing, leading to trapped moisture.
By building in a routine for cleaning and checking the condition of your windows, you can minimise the chances of condensation forming, making sure your home stays dry and comfortable, especially during the winter months.
Here are some practical tips to help maintain your windows and prevent condensation build-up:
Wipe down windows: Regularly wiping down windows removes any moisture build-up before it causes damage.
Check window seals: Inspect the seals on your windows for any signs of wear or damage, and repair or replace them as needed.
Clean frames and tracks: Dirt and debris can affect how well your windows seal, so clean the frames and tracks regularly to ensure a snug fit.
Say goodbye to condensation
Condensation on double-glazed windows is a common winter problem, but it’s not one you have to live with. By improving ventilation, keeping a consistent indoor temperature, and insulating your conservatory roof, you can greatly reduce the amount of moisture that settles on your windows.
If you’re dealing with condensation inside or between the panes, make sure you take action before it gets worse and causes more permanent damage.
Want more tips on keeping your home cosy and energy-efficient? Follow the CosyPanels blog for advice on looking after your conservatory and home all year round.
Related blogs that may be of interest:
Cheapest ways to insulate a conservatory roof