How to reduce condensation on windows: causes and solutions
Condensation on your windows might seem like a minor annoyance, but it can also be a sign that something’s not quite right. Whether it’s a bit of fog first thing in the morning or a constant mist between the panes, understanding what causes condensation can help you stop it in its tracks. And in some cases, it might be time to think about a replacement.
At Leeds Glass, we’ve been helping local homeowners across West Yorkshire with glass and glazing for more than 40 years. In this guide, we’ll explain the different types of window condensation, how to reduce condensation on windows and what to do when it won’t go away.
What causes condensation on windows?
Condensation on windows happens when warm, moist air comes into contact with a cold surface, like a window. You’ll usually see it more in winter, when the temperature difference between indoors and outdoors is at its highest. Common causes include:
• Cooking, showering or drying clothes indoors
• Poor ventilation
• High humidity in the home
• Gaps in insulation or older windows
Occasional condensation on cold mornings is usually nothing to worry about but keep an eye on it if it becomes more frequent. But if your windows are constantly misted up, especially condensation between window panes, it might be a sign of a bigger issue.
Different types of window condensation
Before you try fixing it, it helps to know where the condensation is forming. There are three main types:
• Condensation on the inside of the window
This is the most common and usually the easiest to fix. It’s caused by too much moisture inside the house, especially in rooms like kitchens and bathrooms.
• Condensation on the outside of the window
This means your windows are doing a good job! It usually happens overnight on high-performance double or triple glazing. It’s caused by the outside pane being cooler than the morning air. Nothing to worry about here.
• Condensation between the panes
This is a sign your sealed unit has failed. Moisture has managed to get between the panes of glass, and once it’s there, it’s not going away on its own. This is known as double glazing condensation and it often means the unit needs replacing.
How to reduce condensation on the inside of windows
If you’re seeing foggy glass on the inside of your windows, here are a few things that might help:
Improve ventilation
• Open trickle vents (or consider fitting them if you don’t have any)
• Use extractor fans in bathrooms and kitchens
• Open windows regularly to let fresh air in – even just for a few minutes
Find out more about trickle vents in our guide for Leeds homeowners
Manage moisture
• Dry clothes outside if you can, or use a vented tumble dryer
• Keep lids on pans when cooking
• Use a dehumidifier if needed
Keep rooms at a steady temperature
• Sudden changes in temperature can increase condensation
• Try to maintain a background level of heating during colder months
These tips can all help reduce window condensation caused by everyday household activities.
What to do about condensation between window panes
If you’ve got condensation between window panes, it usually means the seal on your double glazing has failed. When this happens, moisture and air get trapped between the layers of glass, making the window look foggy or misted.
Unfortunately, once a sealed unit fails, there’s no quick fix. The glass can’t be demisted or repaired in the same way you’d wipe away internal condensation. Fixing misted windows often means replacing the unit.
If your double glazing is foggy, we can usually replace just the glass, not the whole frame, to keep things simple and cost-effective. Whether it’s your home or business, we’ll make sure everything’s clear, energy-efficient and looking its best again.
When should I replace my windows?
Not every misted window means your whole window unit needs replacing. In many cases, you can simply replace the failed double-glazed unit and leave the frame intact.
However, there are times when it’s worth considering a full replacement:
• Your windows are old and showing signs of wear
• The frames are warped, damaged or letting in draughts
• You’re thinking of upgrading to a more energy-efficient option
We’ll always give you honest advice about what’s best for your property and your budget.
Need more advice? We’ve covered the signs you might need to replace your windows – from condensation between panes to higher heating bills.
How to prevent condensation in the future
Preventing condensation is all about managing moisture and keeping your home well ventilated. Here are a few simple steps:
• Use extractor fans and open windows regularly
• Fit trickle vents if your windows don’t have them
• Keep your heating steady in colder months
• Check for any issues with insulation or draughts
• Maintain your windows – clean the seals, check for damage and act early if you spot misting
These changes can make a big difference to everyday window moisture problems.
Why choose Leeds Glass?
We’ve been working with local homeowners across Leeds and West Yorkshire for decades. We understand the challenges that come with older properties, changing weather and high heating costs. And we’ll always give you practical, straight-talking advice – no pressure or pushy sales.
Whether you’re dealing with double glazing condensation, thinking about an upgrade, or just want to know your options, we’re here to help.