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UK households told to open windows at exact times to stop common autumn problem
Mirror | September 18, 2025 6:39 PM CST

UK households are being urged to crack open their windows during particular times to combat mould and dampness.

As we move deeper into autumn, the chillier, damper conditions frequently bring the familiar problem of condensation, which can result in mould growth and moisture issues.

Whilst the natural reaction might be to seal windows shut to preserve heat, a glazing expert cautions that this approach could lock moisture inside, establishing perfect conditions for mould to thrive. Data from Gov.co.uk reveals that on average, 4 per cent of English homes experienced dampness in at least one room.

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Allan Reid, a glazing specialist at Art Windows and Doors, recommends that taking a preventative stance on air circulation now is vital to avoid a more serious issue when winter sets in, reports Chronicle Live.

"Mould thrives on moisture. When we're cooking, showering, and even just breathing, we're releasing warm, humid air into our homes," he explains.

"If that air has nowhere to escape, it condenses on cold surfaces like windows and walls. This is what leads to those tell-tale black spots of mould. The solution isn't to open windows all day, which would make the house cold, but to ventilate smartly and at the right time."

How to prevent mould and damp this autumn

Steer clear of opening windows during daylight hours when temperatures drop outside. Rather, open them for merely 10 to 15 minutes between 7am and 9am.

The outdoor air is frequently less moisture-laden than the humid air locked inside overnight, enabling you to release dampness without allowing excessive cold indoors.

If your contemporary windows have a night vent or tilt-and-turn setting, make use of it overnight in bedrooms to permit a small amount of airflow whilst keeping the window securely locked.

Always engage extractor fans in kitchens and bathrooms when cooking or showering to eradicate excess moisture at the source.

Air-drying laundry on radiators or racks is one of the largest contributors to indoor humidity and mould. Steer clear of doing so and utilise a tumble dryer or air the clothes outside if feasible.

A well-sealed home is less prone to mould because it better manages airflow. Inspect your windows and doors for gaps and seal them with draught-proofing strips if required.

By adopting these straightforward steps now, Brits can relish a warm, dry home this autumn without the concern of unwelcome damp and mould.

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