Between damp-loving mould spores, lengthening pollen seasons and winter smoke, Irish indoor air earns more attention than it gets. We compared true-HEPA purifiers on the numbers that matter — CADR per room size, five-year filter costs, and night-time noise — then picked five winners across budgets from €90 to €500.
Price and availability accurate as of publishing; subject to change.
Buying guide: how to choose
HEPA means H13 or it doesn't mean much
Look for 'True HEPA' H13/H14 — filters capturing 99.95%+ of 0.3-micron particles. 'HEPA-type' or 'HEPA-like' is marketing for lesser filters. For Irish mould spores (1–20 microns) and pollen (10–100 microns), genuine H13 catches essentially everything.
CADR is the horsepower figure
Clean Air Delivery Rate tells you how much purified air the unit moves. Match it to your room: you want the room's volume cleaned 3–5 times per hour. A typical 20 m² Irish living room (~50 m³) needs a CADR of 150–250 m³/h minimum.
Filter costs are the real price
A €150 purifier with €60 annual filters costs more over five years than a €250 unit with €30 filters. We factor replacement costs into every recommendation — it's where cheap brands claw their money back.
Placement and runtime
Run continuously on low/auto rather than blasting occasionally — particle levels rebound within hours. Place 30+ cm from walls, ideally in the room you sleep in: you spend a third of your life there breathing its air.
Frequently asked questions
Do air purifiers help with mould in Irish homes?
They capture airborne mould spores (H13 HEPA catches them efficiently) which reduces spread and inhalation — but they don't fix the moisture source. The winning combo for damp Irish homes is dehumidifier (stops growth) + purifier (clears spores).
What size air purifier do I need?
Match CADR to room volume: aim for 3–5 air changes per hour. Bedroom (~30 m³): CADR 100–150. Living room (~50 m³): CADR 150–250. Open-plan (~80 m³+): CADR 300+. Undersized purifiers running flat-out are loud and ineffective.
How much do air purifiers cost to run in Ireland?
Very little: most run 5–30 W on low/auto — roughly €1–3 per month running continuously. The real cost is filters: €25–70 per year depending on brand. Check filter prices before buying the machine.
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