Winter brings shorter days, colder temperatures, and one particularly frustrating household problem: condensation on windows. That misty, dripping film on your glass every morning is more than just an annoyance — left unchecked, it can lead to mould, damaged window frames, and even structural damp. Here’s everything you need to know about how to get rid of condensation on windows in winter.
What Causes Condensation on Windows?
Condensation forms when warm, moist air inside your home meets a cold surface — like a window pane. The air can no longer hold its moisture, so it deposits it as water droplets on the glass.
Common sources of indoor moisture include:
- Cooking and boiling water
- Showering and bathing
- Drying clothes indoors
- Breathing (yes, really — a household of four produces several litres of moisture per day)
- Gas hobs and unvented tumble dryers
In winter, the problem worsens because the temperature difference between inside and outside is at its greatest, making windows the coldest surface in the room.
Double Glazing vs Single Glazing: Does It Make a Difference?
Yes — significantly. Single-glazed windows have just one pane of glass, which gets very cold very quickly. Double glazing has two panes with a gap of inert gas (usually argon) between them, which acts as insulation and keeps the inner pane warmer.
If you’re still on single glazing, upgrading to double glazing is one of the most effective long-term solutions. It won’t eliminate condensation entirely, but it dramatically reduces it.
That said, even double-glazed windows can suffer from condensation — particularly if the seals have failed (you’ll notice a foggy or milky appearance between the panes) or if indoor humidity is very high.
Ventilation Tips to Reduce Condensation
Improving airflow is one of the simplest and most effective ways to tackle condensation. Here’s how:
- Open windows briefly each morning — even 10 minutes of fresh air can flush out overnight moisture build-up.
- Use extractor fans in kitchens and bathrooms, and leave them running for 15–20 minutes after cooking or showering.
- Don’t block air vents — trickle vents on window frames exist for a reason. Keep them open.
- Leave internal doors open to allow air to circulate throughout the home.
- Avoid drying clothes on radiators — this releases a huge amount of moisture into the air. Use a vented tumble dryer or dry clothes outside when possible.
Using a Dehumidifier
A dehumidifier actively pulls moisture from the air, which directly reduces the amount of condensation that can form. They’re particularly useful in rooms with poor ventilation, such as bedrooms or utility rooms.
Key tips for using a dehumidifier effectively:
- Place it in the room where condensation is worst
- Empty the water tank regularly (some models have a continuous drain option)
- Set it to maintain humidity between 40–60% — this is the ideal range for comfort and condensation prevention
- Run it overnight in bedrooms, where breathing adds significant moisture
Dehumidifiers do use electricity, so factor that into your running costs. Modern models are fairly energy-efficient, and the cost is usually worth it compared to the damage condensation can cause.
Anti-Condensation Film and Window Insulation
If you can’t upgrade your windows right now, anti-condensation film is a budget-friendly option. It’s a thin, transparent film applied directly to the glass that slightly raises the surface temperature, reducing the likelihood of moisture settling.
Other window insulation options include:
- Secondary glazing film kits — a plastic film stretched across the window frame and shrunk with a hairdryer to create a secondary barrier
- Draught-proofing strips — sealing gaps around frames reduces cold air ingress and helps maintain a more stable temperature
- Thermal curtains — heavy curtains trap warm air near the window, but be aware they can also trap moisture if not pulled back during the day
When Condensation Signals a Bigger Damp Problem
Surface condensation on windows is usually manageable with the steps above. But sometimes, persistent moisture is a sign of something more serious.
Watch out for these warning signs:
- Damp patches on walls or ceilings that don’t dry out
- A persistent musty smell
- Black mould appearing on walls, not just window sills
- Peeling wallpaper or bubbling paint
- Damp appearing at the base of walls (this may indicate rising damp, not condensation)
If you’re seeing these signs, the issue may go beyond simple condensation. Rising damp, penetrating damp, or a failed damp-proof course all require professional assessment.
In these cases, a thorough specialised cleaning service can help address the visible effects — including mould removal — while you arrange for the underlying cause to be investigated.
Daily Habits That Help
Small changes to your daily routine can make a real difference over winter:
- Put lids on pots when cooking
- Keep bathroom doors closed when showering
- Wipe down windows and sills each morning with a dry cloth or window vac
- Heat your home consistently rather than letting it get very cold overnight — cold surfaces attract more condensation
When to Call in the Professionals
If condensation has already led to mould growth or staining on your walls, window frames, or soft furnishings, it’s worth getting a professional clean. DIY methods can shift surface mould, but they often don’t fully eliminate spores embedded in porous materials.
AKTE’s home cleaning services team can help restore affected areas, and our specialised cleaning service covers more intensive mould and damp remediation work.
Summary
Condensation on windows in winter is common, but it’s not something you have to live with. The key is reducing indoor moisture, improving ventilation, and keeping surfaces warmer. Start with the simple fixes — open windows, use extractor fans, and wipe down glass daily — and escalate to dehumidifiers or window upgrades if the problem persists.
And if condensation has already caused damage, don’t ignore it. Addressing it early is always cheaper and easier than dealing with the consequences later.
