Is condensation on my windows bad for health? Three key warning signs – and how to fix it

B&Q advises on how to remove mould from your home

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Condensation appears on windows as a result of humidity and temperature. When the glass becomes cooler than the air around it, water molecules in the air come together and form a thin layer of water droplets. At best, this can be an annoyance in the home that requires some cleaning, but at worst it could have a detrimental impact on your health.

Is condensation on my windows bad for health?

In small amounts, condensation is nothing to worry about.

However, if left to build up for long periods of time, it can lead to black mould.

For those with certain pre-existing conditions, such as asthma, black mould can be very dangerous.

In large quantities, mould spores can cause health problems for anyone.

Babies and young children, the elderly and those with allergies are also at risk from a build-up of mould.

Most commonly, black mould can cause cold-like symptoms, including a dry cough, runny nose, watery eyes, a sore throat or wheezing.

Though not all condensation can cause such problems, there are three major signs your condensation may lead to issues.

1. If black mould is beginning to form around your window frames

2. If the water from condensation is beginning to pool around your window frames

3. Patches of damp are beginning to form on the walls surrounding your window.

The key to avoiding build-up is by tackling condensation immediately.

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How can I combat condensation?

Wipe the water away

One way to prevent condensation from building up is by simply wiping it away from windows.

Use soapy water to remove the condensation, followed by a dry cloth to remove any moisture.

In some cases, it may then be necessary to throw away both cloths to avoid contamination.

Use a dehumidifier

Purchasing a dehumidifier can also help reduce the amount of moisture in the air.

Place the dehumidifier near the windows where you see condensation most often.

Make use of a fan

In rooms such as the kitchen or bathroom, ensuring your fan is switched on can help to reduce the risk of condensation buildup.


Although opening your windows might not be the most desirable option in the winter months, it can work wonders to help banish condensation.

Try to do this when you are cooking, in the shower or even when you are in bed.

Opening your windows for just 20 minutes a day can help to reduce the effects of condensation.

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Turn on the heating

Increased home heating can help to improve insulation and stop surfaces from getting too cold.

According to Karcher retail assistant product manager, James Mokler: “Ensuring that there’s a regular warm temperature around your home will stop surfaces from getting cold enough for condensation to build.

“The heating doesn’t need to be on constantly throughout the day, but a timer can be used to switch on the heating during the coldest periods, keeping surfaces warm and preventing condensation from forming.”

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