As the temperature drops, many UK homeowners notice a familiar problem—condensation forming on double glazed windows. It’s not only annoying but can lead to mould, damage, and health issues if left unchecked. If you’re wondering how to stop condensation on double glazed windows in winter, this guide offers practical, effective tips tailored to UK homes.
Why Does Condensation Happen in Winter?
Condensation forms when warm, moist indoor air hits the cold surface of your window glass, causing the moisture to turn into water droplets. It’s particularly common during winter.
Common Causes:
- Daily activities like cooking, showering, and drying clothes indoors
- Inadequate ventilation
- High indoor humidity levels
- Poor insulation
Is Condensation Always a Problem?
Occasional condensation on the outside of your windows is actually a sign of good insulation. But internal condensation—between the panes or on the inside surface—should not be ignored.
Potential Issues:
- Mould growth on frames, sills, and walls
- Damage to timber window frames and internal plaster
- Musty smells and reduced air quality
- Long-term impact on health and comfort
How to Stop Condensation on Double Glazed Windows in Winter
Here are tried-and-tested UK strategies for reducing and preventing condensation in colder months.
1. Improve Ventilation
- Open trickle vents on your windows to allow moisture to escape
- Use extractor fans in kitchens and bathrooms during and after use
- Keep interior doors open to encourage airflow
2. Reduce Indoor Humidity
- Avoid drying clothes indoors or use a vented tumble dryer
- Cover pans while cooking and use an extractor hood
- Invest in a dehumidifier for high-moisture rooms like bedrooms and bathrooms
3. Maintain Consistent Indoor Temperatures
- Sudden temperature changes increase condensation risk
- Keep your home heated to at least 18°C in all rooms during cold months
- Use thermostatic radiator valves to regulate temperatures in specific areas
4. Check Window Seals and Units
- Damaged or worn seals can allow cold air in and warm air out
- If moisture appears between the panes, the sealed unit has failed
- In such cases, you’ll need to replace the double glazed unit, not the whole window
As you’re wondering how to stop condensation on double glazed windows in winter, know that Cove Glass can assess and replace failed units quickly – visit our double glazing service page for more information.
5. Upgrade to Energy-Efficient Glass
If your double glazing is more than 15 years old, it may not meet current energy standards.
- Consider upgrading to Low-E (low emissivity) glass
- It reflects heat back into the room while reducing outside condensation
- A professional assessment can help determine if it’s time to upgrade
6. Use Insulating Window Treatments
- Heavy curtains and thermal blinds help keep the window surface warmer
- Warmer glass means less chance for condensation to form
- Make sure to open them during the day to let moisture escape
How to Stop Condensation on Double Glazed Windows in Winter: When to Call a Professional
If you’ve tried the above and still see frequent condensation—especially between panes—you likely have a failed sealed unit. A specialist can inspect the issue and recommend either a glass-only replacement or full unit upgrade.
Contact Cove Glass for expert double glazing repairs and replacements across the South East.
How to Stop Condensation on Double Glazed Windows in Winter: Breathe Easier This Winter
Knowing how to stop condensation on double glazed windows in winter isn’t just about comfort—it’s about protecting your home. With the right combination of ventilation, temperature control, and professional support, you can enjoy clear views and a healthier indoor environment all season long.
📞 Call: 01252 318787
📧 Email: sales@coveglass.co.uk
🌐 Visit: Double Glazing Services
How to Stop Condensation on Double Glazed Windows in Winter FAQs
Q1: Why do my windows get condensation every morning in winter?
A1: It’s usually due to overnight humidity from breathing and lack of ventilation. Using trickle vents and maintaining even heating can help reduce this.
Q2: Is condensation between double glazing panes fixable?
A2: No. This usually means the unit seal has failed. You’ll need to replace the glass unit to restore insulation.
Q3: Will a dehumidifier stop condensation completely?
A3: It can significantly reduce it by lowering indoor humidity levels but should be combined with ventilation for the best results.
