CLEANING · PRACTICAL GUIDE
How to reduce condensation at home
Start with everyday moisture and ventilation, then decide whether a monitor or dehumidifier would help your household.
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Notice when and where moisture appears
Condensation forms when moisture in the air meets a cold surface. Record whether wet windows appear after showers, cooking, indoor drying or overnight. A short diary helps you discuss a recurring problem and compare changes. A wet patch that persists, grows after rain or appears near plumbing may have another cause; do not assume every damp mark is condensation.
Reduce moisture at the source
Use lids where appropriate when simmering food. Use bathroom and kitchen extraction during moisture-producing activities, following the equipment instructions. An extractor that vents outdoors removes air; a recirculating cooker hood does not extract moisture outside. If drying laundry indoors, choose a suitable space and plan how moisture will leave it. Avoid using radiators as a drying rack.
Keep the ventilation your home needs
Keep intended vents unobstructed and use boost settings as instructed. Ventilate after cooking or showering, and when drying clothes indoors. If you have continuous mechanical ventilation, follow its operating guidance rather than switching it off to save power. Never cover ventilation required for a fuel-burning appliance. A draught strip should not seal an intentional air supply.
Check the pattern before buying equipment
A temperature and humidity monitor can help you record trends, but a single reading does not diagnose a building problem. Compare readings in the same position and at similar times, keeping the monitor away from direct steam and heat. Note room use alongside the number. Treat it as information to help make decisions, rather than a promise that one device can identify the cause of damp.
Decide whether a dehumidifier suits the job
A dehumidifier removes moisture from indoor air and may help manage indoor drying or excess humidity. It does not repair leaks or replace fresh-air ventilation. Compare the model’s recommended room conditions, operating temperature, noise, tank emptying and power use. Check clearance and placement in its manual. Choose it for the room and routine where it will actually operate, rather than its headline extraction figure alone.
Know when to ask for help
Damp, mould, failed extraction or suspected leaks need prompt attention. Tenants should report problems to their landlord or managing agent; homeowners can arrange appropriate building or ventilation advice. Keep dated photos and notes while seeking help. The cause may involve the building, heating, ventilation or leaks; ordinary household activities are not a diagnosis. Follow authoritative guidance for mould problems and never improvise chemical mixtures. Products and surface cleaning do not replace addressing the underlying cause.
Product examples for these jobs
Buy only if an item solves a problem in your home. Follow the links for buying checks, then check the current price and exact specifications on Amazon UK.
Common questions
Will a dehumidifier fix every damp problem?
No. It can remove moisture from the air, but leaks, water penetration and ventilation faults need their own assessment and repairs.
Does a fan remove humidity?
A normal circulating fan moves air around the room. It does not extract air outdoors or collect water like a dehumidifier.
More practical guides
Sources and further reading
Ventilation and damp-and-mould guidance reviewed on 13 October 2026. The linked government damp-and-mould guidance applies to England.