Noticing a foggy layer or water droplets trapped between the panes of your double-glazed windows? That hazy view isn’t just annoying—it’s a sign that moisture has made its way into the sealed unit, due to a broken or failing seal. To be clear, we are not talking about condensation on the inside of your windows, we are referring to condensation trapped in between the panes of your double-glazed unit. Unfortunately, this type of condensation can’t be wiped away from the inside or outside and ignoring it can reduce your window’s insulating efficiency over time. The good news? There are ways to tackle this problem, from temporary solutions, professional repair options to full replacements, that can bring back both your clear view and your window’s energy-saving benefits. Here’s what you need to know…
Understanding The Problem
Condensation between the panes of a double-glazed window typically signals a problem with the window’s seal. Double-glazed windows are made up of two panes of glass separated by a spacer (which is often filled with an insulating gas like Argon), creating a sealed air gap. This spacer design helps with insulating your home by keeping outside air and moisture out.
When the seal around the window deteriorates or breaks (often due to age, temperature fluctuations, or damage), it allows moisture-laden air to seep into that gap. Once inside, this moisture is trapped, and because the sealed space is difficult to ventilate, the water vapour condenses on the glass. That’s why you see fogging, misting, or even droplets forming between the panes.
Not only does this trapped condensation make your windows look foggy and reduce visibility, but it also compromises the insulating properties of the double glazing, making it less energy-efficient. Unfortunately, once condensation appears between the panes, it’s usually a sign that the window unit may need professional repair or replacement.
Short-Term Solutions
Use A Dehumidifier
Although they won’t remove moisture between the panes directly, running a dehumidifier in your home can reduce overall humidity and potentially slow down further condensation buildup. This popular electrical appliance can really help reduce humidity in the air without hiring a professional. Simply place the dehumidifier in front of the window and leave it on. Over time, it should absorb the condensation that is stuck in between the windows.
Use Space Heaters And Hairdryers
These are easy appliances to get hold off and can be used to help clear the condensation between panes by simply placing them by the window and leaving on. This will help absorb the moisture trapped in between the double-glazing.
Sun Exposure
On a sunny day, letting sunlight hit the window may sometimes evaporate minor moisture buildup temporarily, but this is a very short-term fix and not reliable for sealed units with broken seals.
Long Term Solutions
Now, while DIY fixes can address condensation on the inside of windows, addressing moisture between the panes in the long-term often requires professional help or replacement to fully restore the window’s functionality and appearance. You basically have two options for a long-term solution which are to repair or replace:
Window Repair Or Resealing
Some window repair services specialise in removing moisture from between the panes and resealing the window. They use tools to drill tiny holes in the glass, allowing trapped moisture to escape. Once the moisture is out, they reseal the pane to prevent future condensation. This is less costly than a full replacement but may not work for every window.
In some cases, if the damage isn’t too extensive, replacing the seal around the window can help keep out future moisture. However, this still requires a professional to ensure the unit remains airtight.
Complete Window Unit Replacement
Often, the most reliable solution is to replace the affected window unit entirely. Since double glazing is designed to be a sealed unit, a broken seal usually means that its insulating properties are permanently compromised. Replacing it restores both clarity and insulation efficiency. While this option can be more expensive, it’s often the most effective and long-lasting.
While we can’t help you fix your windows, we can certainly help ensure that your home is heating as efficiently as possible. We recommend having an annual boiler service to make sure everything is running smoothly and efficiently, and to avoid bigger problems later down the line. Book your boiler service at your convenience – you won’t regret it!
