Condensation is the most typical reason of damp in a structure, and windows are a major source. If you can stop condensation from windows, you’ll be making an important contribution to resolving the issues it causes.

Why is condensation a problem?

When moist, warmer air meets a cool surface, condensation occurs. The air cools but is unable to retain the moisture, so it releases it into the environment. If moisture caused by condensation collects on surfaces, mould may develop. Windows do not cause condensation; rather, they provide a ideal habitat for mold because they are the coldest indoor surfaces.

Humidity is present in indoor air, especially because of everyday living and during the colder months when the air inside is significantly warmer than that outside. It shrinks as it cools, and moisture condenses on window glass. Condensation is generally visible on your windows FIRST, but it’s also likely to happen elsewhere throughout the property and can cause plaster deterioration, wallpaper fading, and paint or woodwork damage.

It’s also possible in cases where there is double glazing on the exterior of your windows, and it forms as well. What can you do to prevent condensation from forming on your windows?

How to tackle interior window condensation

You don’t have to accept fogged-up or dripping windows, because there are a few things you can do about interior condensation.

Get a moisture eliminator


Moisture-removing goods are widely available and can help to remove unwanted moisture from the air. They generally contain tiny crystals that absorb moisture and change it into a saltwater solution. To collect the moisture produced by the crystals, you hang them on the ground beneath them with a pail or similar object.

Switch on bathroom and kitchen extractor fans

If you remember to turn on an extractor fan after cooking, taking a bath or shower, or washing the dishes, moisture will be removed from the air. For around 20 minutes after cooking or washing, you should keep the fan going. Fans that switch off automatically when the humidity is acceptable may be worth considering.

Improve air circulation

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Don’t just use ceiling fans in the summer when it’s hot. Using a fan in the winter will help circulate the air inside, revolving clockwise to push warm air from the ceiling towards the floor.

Open the windows

Another example of a cooler season weather condition that is nevertheless quite common during the winter months. If you leave your windows open on a regular basis in the winter, you will be able to remove some of the heat, moist air trapped indoors.

Raise the window temperature

The more you can keep water from condensing, the easier it will be to maintain your house warm. Moisture forms when heated air meets cold window surfaces. To prevent condensation, the room’s temperature should be increased, or curtains, blinds, or drapes should be utilized.

Install storm windows

You may either fasten or permanently mount storm windows to your normal ones, depending on the type. They function in the same way as insulated glass and are frequently a good choice for older houses because of their space between the two windows.

Make sure your windows are well-ventilated by removing the window grills and weatherstripping them.

Storm windows reduce drafts and heat loss by reducing the flow of warm air out of a house. While storm windows can help alleviate interior window condensation, they may attract it, so weatherstripping might come in handy.

DIY window insulation

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A window insulation kit may be a cost-effective method to insulate your own windows. They are made of a transparent film that you place on the inside of the window, trapping air between the window and plastic film; or weather sealing strips (see above). Note: these only work on single-pane windows rather than double or triple-glazed ones

If you use a humidifier turn it down

A humidifier reduces the amount of dry air in a home. It can help with dry skin and lessen the severity of cold or flu symptoms. A humidifier, on the other hand, can cause condensation by releasing moisture into the air. Reduce its strength if possible.

Get a dehumidifier

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A dehumidifier, unlike a humidifier, removes moisture from your house and absorbs condensation. Dehumidifiers for homes range from larger to smaller models and sizes, as well as portable mini versions.

Move your indoor plants

Any plants you have indoors will naturally release moisture into the air. If you have several houseplants by your windows, try moving some of them to reduce the concentration of moisture they release.

Consider moving furniture

If you relocate your furniture at least 50mm from external walls, air circulation will be enhanced. Only keep wardrobes against internal rather than external walls if possible.

Positive Input Ventilation system (PIV)

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When you’ve tried some of these self-help techniques and you’re still having trouble setting up a PIV system, it’s time to think again. This equipment is included in your loft area and works by pushing the moist air out of the property before it has a chance to condense on surfaces using positive pressure.

Condensation in between windowpanes

This can happen in double-glazed windows, and it indicates that the seal has failed. The moisture is trapped between two panes with nowhere to go as a result of the condensation. If this is the case, replacing the glass is the only way to fix the condensation problem.

If ignored, it may eventually reach the floor below, causing issues such as black mould or even wet or dry rot.

Exterior condensation

Condensation on the outside of your windows is a natural, meteorological occurrence. It does not imply that your windows are broken and will evaporate with the onset of warmer weather.