How to Stop Condensation on Windows: Complete 2024 Guide

Table Of Contents

Ever wonder why your windows constantly fog up and drip with condensation? You’re not alone.

Many business owners deal with excess moisture condensation on their office building windows at some point. The good news is apart from hiring glazing experts, there are some simple steps you can take to get rid of condensation for good and regain clear views. In this article, we’ll walk you through the causes of foggy windows and how to stop condensation on windows once and for all!

What Causes Condensation on Windows?

That foggy film of water droplets on your windows is more than an annoyance; it can lead to long-term damage if left unchecked. Before seeking how to stop condensation on windows overnight, you first need to understand why it’s happening.

The 3 main causes of window condensation are:

  • Temperature differences
  • Lack of ventilation
  • High humidity from moisture-laden air

1. Temperature Difference

The primary cause of condensation on windows is a difference in temperature between the air in your building and the glass in your windows. Warm, moist air carries water vapour, and when this humid air comes into contact with a cooler surface like window glass, the vapour condenses into water droplets.

2. Lack of Ventilation

Inadequate ventilation is a major contributor to condensation — when warm, moist air can’t escape from your building, it builds up and clings to windows. Things like exhaust fans, attic fans, and open windows improve airflow and help remove excess moisture. Make sure any air vents or fans in your building are clear of dust and operating properly.

3. High Humidity

Excessive moisture in the air, known as high relative humidity, is another major trigger of condensation on windows. The higher the amount of water vapour present in the air, the higher the likelihood of it being deposited on your building windows.

You can monitor the humidity in your building with a hygrometer and use a dehumidifier to remove excess moisture when levels get too high. Aim for 40–55% relative humidity for the most comfortable and condensation-free environment.

Having understood what causes condensation on windows, let’s consider some quick fixes to combat condensation.

3 Quick Fixes to Reduce Window Condensation

Condensation on windows can seem like an unsolvable problem. But don’t worry; there are a few quick fixes you can try to reduce window condensation for now and improve the situation.

To stop condensation on windows overnight in winter or any other time of the year, try the following:

  • Increasing ventilation
  • Controlling your thermostat
  • Improving insulation

1. Ventilate and Circulate Air

One of the main causes of window condensation is excess moisture in the air. Opening windows and using fans to improve airflow and circulation can help.

Consider the following tips:

  • Open windows in your building, especially in the room where condensation is the worst. This allows moist air to escape and drier air to enter.
  • Use a portable fan and point it at the window. The breeze will keep the air around the window moving, so condensation has a harder time forming.

2. Control the Thermostat

The temperature difference between the inside and outside of your building directly impacts window condensation. Try adjusting the thermostat to balance the temperatures.

Here are some helpful tips:

  • Lower the temperature in your building by a few degrees. This reduces the difference between the indoor and outdoor temperatures, so less condensation forms.
  • Use a programmable thermostat to slightly lower the temperature overnight and while off-duty. This saves energy and reduces condensation.

3. Improve Insulation

Adding insulation helps regulate the temperature in your building, reduce moisture, and prevent warm, moist air from escaping to cold surfaces where it condenses.

Add weatherstripping tape or caulk around windows and doors to seal any air leaks or drafts. This prevents warm, moist air from reaching the cold glass.

You can also install air bricks on the outside of your office buildings.

These quick fixes are how to stop condensation on windows overnight in the UK and provide relief until you can address the underlying issues causing excess moisture in the building. The next section provides a more permanent solution to the damp problem to prevent window condensation for good.

Long-Term Solutions to Prevent Window Condensation for GOOD

Condensation on windows is caused by excess moisture in the air coming in contact with cold glass surfaces. To stop condensation on bedroom windows and office glasses for good, you need to get to the root of the condensation problem by lowering humidity levels in your building and preventing warm, moist air from reaching the windows.

You should consider the following solutions:

  • Bubble Wrapping: Apply bubble wrap to the inside of the problem windows using double-sided tape. The air pockets in the bubble wrap act as an insulator.
  • Plastic Sheeting: Apply clear plastic sheeting over the inside of windows and seal the edges with tape. This creates an airtight barrier while still allowing in light.
  • Upgrading to Triple-Glazed Windows: For the most effective long-term solution, consider replacing old or inefficient windows with triple-pane, low-emissivity (low-E) windows. These provide an insulating barrier of dead air space between the panes to significantly improve the window’s R-value and prevent condensation.

Note: R-value measures a window’s level of resistance to heat transfer.

With some detective work to determine the sources of excess moisture and a commitment to sealing, insulating and controlling humidity levels in your building, you can say goodbye to condensation on windows for good. The small investments you make to improve ventilation here now will pay off through greater comfort, energy efficiency and reduced heating costs over time.

The most recommended permanent fix to stop condensation on double-glazed windows in winter is upgrading your windows to triple-glazed variants. We’ll expand on the differences between double and triple-glazed windows in the next section.

Upgrade Your Glazing: Double vs Triple Glazed Windows

Upgrading from double to triple-glazed windows is one of the best ways to improve the energy efficiency of your building and reduce heating bills. Double-glazed windows have an R-value of 3.0–3.8, meaning they don’t insulate as well as triple-glazed windows, which have an R-value of 7–8.

With triple glazing, you’ll gain an additional pane of glass that gets rid of double-glazing problems and offers the following perks:

  • Superior insulation
  • Lower energy bills
  • Lesser noise and increased durability

1. Superior Insulation

The extra pane of glass in triple-glazed windows creates an insulating air pocket that’s far more effective at preventing heat transfer. Studies show triple glazing can reduce heat loss through windows by up to 30% compared to double glazing. This improved insulation will make your building more comfortable year-round by blocking outside noise and preventing draughts.

2. Lower Energy Bills

The increased insulation of triple-glazed windows means less heat escapes in winter and less heat enters in summer. This can significantly lower your heating and cooling costs. Businesses can enjoy energy bill savings of up to 50% after upgrading to triple-glazed windows. The additional upfront cost of triple glazing can pay for itself in just a few years through energy savings.

3. Lesser Noise and Increased Durability

The extra glass pane acts as a sound barrier, reducing outside noise by up to 54 dB compared to 52 dB in double-glazing windows. Triple-glazed windows are also more durable and long-lasting. The hermetically sealed panes protect against condensation and mineral buildup for enhanced longevity.

For more details on how these two window glass options compare, check out our triple-glazing vs. double-glazing comparison guide.

Upgrading your building’s glazing is one of the most effective ways to improve comfort and energy efficiency for good. While double-glazed windows offer some benefits over single-glazing, triple-glazed windows provide the best overall performance with superior insulation, lower energy bills, reduced noise, and enhanced durability. For the best return on your investment, triple glazing is the clear choice — contact the GLRE glazing team to discuss your project requirements.

However, not everyone has the budget to replace windows, resulting in several theories on ways to prevent condensation on windows. One prevalent myth is that vinegar helps get rid of foggy windows. Is this true, though? Keep reading to find out, as we expound on the validity of this theory and several other myths related to eliminating condensation.

Does Vinegar Stop Condensation on Windows?

Vinegar is a popular natural cleaning solution, but can it actually prevent condensation from forming on windows? Unfortunately, the answer is no.

While vinegar does have disinfecting and deodorising properties that can clean and remove built-up condensation from windows, it does not provide a long-term solution to stopping condensation.

The root cause of condensation on windows is excess moisture in the warm air inside of your building hitting cold window panes. As the warm, moist air cools, it condenses into water droplets on the glass. To prevent condensation, you need to eliminate the excess moisture at its source or prevent the warm air from reaching the cold windows.

So, while vinegar can be used to wipe away and prevent the build-up of water spots and stains from existing condensation, it does not actually eliminate the chances of condensation forming in the first place.

Similarly, there are several other myths about how to stop condensation on the inside of windows. We’ll provide clarification on these myths in the next section.

Top 6 Myths About Stopping Window Condensation

Many myths surround how to prevent condensation when the real solutions are often quite simple.

Here are the most prevalent ones:

Myth 1: Opening windows in the morning prevents condensation.

Many people believe opening windows for 15 minutes a day helps prevent window condensation by allowing warm, moist air to escape. In reality, this only provides temporary relief and does little to address the root causes of excess moisture buildup in the office building, which leads to window condensation.

Myth 2: New windows will fix the problem.

Upgrading to double or triple-glazed windows can help improve insulation and energy efficiency. Still, window condensation is caused by the temperature difference between the indoor air and the window glass, not the windows themselves. Without addressing excess moisture and indoor ventilation issues, new windows may not eliminate window condensation and the problems it causes.

Myth 3: Window condensation only happens in the winter.

While window condensation is more prevalent in cold weather, it can occur any time there are moisture and temperature imbalances in the office building. In the summer, running an air conditioner which cools the air can also lead to window condensation if the humidity levels in the building are high.

Myth 4: Window condensation is unavoidable.

The truth is controlling excess moisture and improving ventilation can significantly reduce or eliminate window condensation. Simple steps like venting tumble dryers to the outside, using extractor fans, and wiping down windows can have a big impact. For persistent issues, it may help to install a dehumidifier or heat recovery ventilation system. With the right solutions, window condensation is often preventable.

Myth 5: Using a heater will prevent window condensation.

While heating your office can make it more comfortable, it doesn’t necessarily prevent window condensation. The warm air can hold more moisture, and when it comes into contact with the colder windows, it can still condense. Proper insulation and ventilation are needed to effectively manage condensation.

Myth 6: Washing windows with dish soap will permanently stop condensation.

Applying dish soap to windows can provide a temporary solution by creating a film that prevents water droplets from forming; however, it’s not a permanent fix. Over time, the soap film will wear away, and the condensation may return. For a long-term solution, you need to manage the humidity levels in your building and improve insulation.

Frequently Asked Questions

Why do I get so much condensation on the inside of my windows?

Condensation on the inside of your windows happens when warm, humid indoor air meets the cool surface of the glass, especially during winter. This is because the cold, dry air outside lowers the temperature of the window pane. In contrast, the indoor air, full of moisture from activities like preparing coffee or heat from computers, releases this moisture onto the cooler surface, leading to water droplets forming.

How do I stop moisture from coming through my windows?

Here are 5 ways to help prevent moisture from seeping through your windows:

  • Use an extractor fan or dehumidifier to remove excess humidity.
  • Upgrade to double- or triple-glazed windows.
  • Enhance loft or wall insulation for better thermal regulation.
  • Regularly inspect for and repair any failed double or triple glazing or damaged seals.
  • Keep doors and curtains open at night to improve air circulation and reduce condensation.

How to stop condensation on double-glazed windows in winter?

To stop condensation on double-glazed windows in winter, the key is proper ventilation. Regardless of window type, open your windows and keep your office door closed each morning when you get to work. This allows moisture to escape and fresh air to circulate, reducing the buildup of condensation on the glass surfaces.

Should I wipe condensation from windows?

Yes, wiping condensation from windows is a good idea, as it helps prevent excess moisture from causing mould and water damage around your window sills. Using a microfiber cloth can efficiently absorb the water without leaving streaks. Plus, managing condensation can help maintain indoor air quality and keep your building comfortable.

Does condensation on windows mean poor insulation?

Yes, condensation on windows can indicate poor insulation. When windows aren’t well-insulated, the temperature difference between the cold outdoors and warm indoors can cause moisture in the air to condense on the glass. This suggests that the windows are not effectively shielding the exterior temperature, leading to condensation.

Therefore, if you’re noticing regular condensation, it might be worth hiring professionals for glazing inspections and insulation upgrades for better thermal performance.

Can you put Fairy Liquid on windows to stop condensation?

Yes, applying a small amount of washing-up liquid, like Fairy Liquid, to your windows can temporarily prevent condensation from forming. It works by creating a thin film that lowers surface tension and prevents water droplets from forming on a cold surface.

Remember, it’s a temporary solution and may not completely stop condensation, especially on colder days. It’s best applied to the bottom of the windows where condensation tends to accumulate the most.


You now understand how to stop condensation on windows for good in your building. No more resuming to foggy windows or having to wipe them down repeatedly. By following these best practices for ventilation, insulation, and window treatments, you’ll create an environment that prevents condensation from forming on your windows, ensuring crystal-clear views all year round.

Once you’re ready to upgrade your building windows for a more permanent solution, contact the GLRE glazing team — we are the go-to industrial glazing replacement company in the UK.

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