How to Stop Condensation on Windows

Condensation on windows is caused by humidity. The best way to stop it is to keep indoor humidity below 60%. But that can be easier said than done.

Window quality can make a huge impact on maintaining room humidity. At Integra Windows, we manufacture and install uPVC double-glazed windows to help homeowners control temperatures and beat condensation once and for all. 

The Right Humidity Level to Stop Condensation

Where possible, indoor humidity should be kept between 30% and 50%, and always below 60%. In winter, staying towards the lower end of that range can help when the glass is particularly cold. A hygrometer gives you a simple way to check where your home sits.

Three Types of Condensation on Windows

1. Condensation on the Inside Surface

Warm, moist indoor air meets cold glass and has nowhere to go but onto the pane. It's the easiest to diagnose and can be easily fixed with ventilation and humidity control.

2. Condensation on the Outside Surface

This looks like a problem, but usually isn't. It happens on cool, still mornings when the outer pane of a well-insulated window remains colder than the outside air, much like dew on grass. Our page on how does double glazing work explains why. 

On well-insulated double glazing, exterior condensation can actually be a sign that less indoor heat is reaching the outer pane.

3. Condensation Between the Panes

Persistent fogging or a milky film trapped inside a double-glazed unit means the seal has failed. No amount of ventilation or humidity control will fix this because the moisture is sealed inside the glass unit itself, not coming from your home. This calls for a replacement.

How to Stop Condensation on Windows Inside Your Home

Once you've confirmed it's indoor condensation, the fixes are straightforward:

• Run exhaust fans in the bathroom and kitchen during and after showers or cooking, and leave them on for 10 to 15 minutes afterwards
• Dry clothes outside or in a vented dryer rather than on an airer indoors
• Crack a window for a few minutes each day, even in winter, to let moist air escape
• Keep lids on pots while cooking

The Window Hardware That Makes This Easier

Tilt-and-turn windows make managing humidity much less time-consuming. The tilt function lets you crack the top of the window open for constant background ventilation, without leaving the whole house exposed to the weather or creating a security risk, as a fully open window does. 

It's one of the few hardware fixes for indoor condensation, rather than just another habit to keep up. Our uPVC tilt and turn windows range is built around exactly that kind of everyday ventilation.

How to Stop Condensation on Windows in Winter in Australia

Winter condensation becomes more common because windows stay cold while moisture from cooking, showers, drying clothes and everyday living builds up indoors. 

The fix isn't to stop heating your home, it's to let a little of that warm, moist air escape regularly rather than letting it build up all winter. Our guide to double glazing in winter covers how insulation and ventilation work together.

Does Double Glazing Stop Condensation?

Mostly, yes. Double glazing keeps the inner pane closer to room temperature than single glass, leaving less cold surface for moisture to land on. It won't override very high indoor humidity, but it lifts the point at which condensation starts to form, which means far fewer foggy mornings.

Condensation on double-glazed windows on the outside face isn't a fault; it's confirmation that the insulation is doing its job. Triple-glazed windows push the inner glass temperature even higher again.

Our page on the benefits of double-glazed windows covers what else changes when you upgrade. 

What Does Condensation Between the Panes Mean?

If you're seeing fog or a permanent haze trapped inside the glass itself, the sealed unit has failed. This is an ageing issue, not a moisture-management one, and no amount of ventilation will fix it.

Seal failure becomes more likely as an insulated glass unit ages, although lifespan varies considerably with product quality, installation and exposure. Read our page on how long uPVC windows last to learn about what affects lifespan, and when replacement makes more sense than repair.

Is Condensation a Sign Your House Is Too Cold?

Not necessarily. Condensation is about humidity meeting a cold surface, not overall room temperature. A warm, well-heated home with poor ventilation and plenty of moisture from cooking, showers, or drying clothes can condense just as badly as a cold one. It's a sign of a humidity gap at the window, not proof that the whole house is cold.

That said, if it's showing up on every window in a home that also feels cold and draughty, it's worth looking at the bigger picture. Our range of double-glazed windows in Sydney covers how upgrading the glass affects comfort, not just condensation.

Beat Condensation for Good with Integra Windows

Habits like ventilation and humidity control go a long way, but the biggest difference comes from the glass itself. At Integra Windows, we manufacture and install uPVC double-glazed windows that keep the inner pane closer to room temperature, so there's far less cold surface for moisture to settle on. Pair that with our tilt-and-turn hardware for effortless everyday ventilation, and foggy mornings become a thing of the past.

Ready to stop wiping down your windows every winter? Get in touch with our team for a free measure and quote and see how the right windows can transform your home's comfort.

Condensation on Windows: FAQs

How do I stop condensation on windows fast?

Open a window or run an exhaust fan for a few minutes, and wipe down the glass so moisture doesn't sit overnight. It's a short-term fix; keeping humidity between 30% and 50% is what stops it coming back.

Does double glazing stop condensation?

It significantly reduces indoor condensation by keeping the inner glass warmer, though it won't override genuinely high humidity. Condensation on the outside of double glazing is normal, and actually a sign it's insulating well.

What does condensation between window panes mean?

It means the seal on that double-glazed unit has failed and moist air has gotten into the gap. Ventilation and dehumidifiers won't fix it, since the moisture is sealed inside the glass.

Is condensation a sign my house is too cold?

Not on its own. It means moist air is meeting a cold glass surface, which can happen in a warm, humid home just as easily as a cold one.