Black mould on walls is a humidity problem wearing a scary costume: keep a room under 60% RH and mould physically cannot grow. For homes already showing spots — window reveals, cold corners, behind wardrobes — you want strong extraction plus air filtration to catch spores. These five pair the muscle with the filters, ranked by how fast they make mould's life impossible.
Price and availability accurate as of publishing; subject to change.
Buying guide: how to choose
Compressor vs desiccant
Compressor models are cheaper to run and ideal for typical Irish indoor temps (15–25°C). Desiccant models work better in cold spaces — garages, unheated rooms under 15°C — but use roughly double the electricity. Most homes want a compressor unit.
Size by litres per day
The headline number (10L, 12L, 20L) is extraction per day under test conditions. Rule of thumb: 10–12L for apartments and bedrooms, 20L for a 3-bed house with drying laundry, 25L+ for big or very damp homes.
Running costs at Irish rates
A modern 12L compressor unit draws ~160 W: about 5–6 cents per hour. Run 8 hours daily and you spend roughly €12–15 a month — usually less than the heating energy wasted evaporating damp air, which is why a dehumidifier can lower total bills.
Laundry mode is the killer feature
If you dry clothes indoors (most of Ireland, most of the year), laundry mode pays for the machine: a good unit dries a load overnight for ~6 cents of electricity versus ~€1.50+ per tumble-dryer cycle, and without the condensation hitting your walls.
Frequently asked questions
Will a dehumidifier stop mould and condensation?
Yes, if you keep relative humidity under 60%. Mould cannot establish below that level. Run the unit on auto with a 50–55% target, keep furniture slightly off cold external walls, and wipe existing mould once with a fungicidal cleaner.
Why is my house so damp in winter?
Cold external walls + sealed windows + indoor moisture (cooking, showers, breathing, drying clothes adds ~10L/day for a family) = condensation. Modern retrofits make houses airtight without adding ventilation. A dehumidifier removes that moisture before it hits the glass.
Dehumidifier or PIV system for a damp house?
A dehumidifier is the fast, no-install fix and handles most condensation damp. PIV (positive input ventilation) suits whole-house problems but needs attic installation and ~€800–1,200 fitted. Start with a €200 dehumidifier; escalate only if damp persists.
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