Meaco MeacoDry ABC 10L
A practical dehumidifier (10 litres/day) for keeping humidity down and preventing mould and condensation.
Does a Dehumidifier Help With Mould? (UK Guide)
Mould and black spots on walls, ceilings and windows are usually a sign of excess moisture in the air. A dehumidifier is one of the most effective tools against it - here's how it helps and what else you need to do.
Quick answer
Yes, a dehumidifier helps with mould by lowering the humidity that mould needs to grow. Keeping indoor humidity below around 60% stops most mould developing. It won't remove existing mould, though - you'll need to clean that off first, then use the dehumidifier to stop it coming back.
How it prevents mould
Mould spores are always in the air; they only grow when humidity is high and surfaces stay damp. By pulling moisture out of the air, a dehumidifier keeps relative humidity in the 40-60% range where mould struggles to take hold. It's especially useful in bathrooms, bedrooms with condensation on the windows, kitchens, and for drying laundry indoors.
What it won't do
A dehumidifier doesn't kill or remove mould that's already there. Clean existing mould with a suitable mould remover (wear gloves and ventilate the room), fix the source if there's a leak or rising damp, then run the dehumidifier to keep the air dry so it doesn't return. For large or persistent damp, get the underlying cause checked.
Getting the best results
Run the dehumidifier in the rooms worst affected, aim for 45-55% humidity (many models show this or let you set a target), and keep doors closed so it works on one space. Ventilate when cooking or showering, and avoid drying washing on radiators without extraction, as that adds a lot of moisture to the air.
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Meaco MeacoDry ABC Range 12L
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Meaco MeacoDry ABC
A practical dehumidifier (compressor) for keeping humidity down and preventing mould and condensation.
Frequently asked questions
What humidity stops mould growing?
Keeping indoor relative humidity below about 60%, ideally 45-55%, stops most mould growing. A dehumidifier with a humidistat can hold the room in that range automatically.
Will a dehumidifier remove existing mould?
No - it stops new mould by drying the air, but you need to clean off existing mould first with a mould remover, then use the dehumidifier to prevent it returning.
Where should I put a dehumidifier for mould?
In the room worst affected by damp or condensation - often a bathroom, bedroom or wherever you dry laundry - with the doors closed so it concentrates on that space.
Bottom line
Our top pick is the Meaco MeacoDry ABC 10L (our score 9.6/10) - A practical dehumidifier (10 litres/day) for keeping humidity down and preventing mould and condensation..