Older Irish housing stock — solid walls, single glazing, suspect ventilation — can produce damp faster than small machines remove it. For 4+ bedrooms, persistent mould or post-leak drying, you want 20–25L of daily extraction, a big tank or hose drainage, and efficiency that doesn't punish all-day running. These five are the heavy lifters.
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
What size dehumidifier do I need for an Irish home?
Apartments and single rooms: 10–12L/day. Standard 3-bed semi: 20L. Large, old or very damp houses: 25L+. Oversizing slightly is fine — bigger units hit target humidity faster and then idle, which is actually more efficient.
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.
How much does a dehumidifier cost to run in Ireland?
A 12L compressor model at ~160 W costs about 5–6 cents per hour at typical rates. Eight hours a day works out around €12–15 per month. Desiccant models cost roughly double — but heat the room as a side effect.
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