A bedroom purifier that's too loud gets switched off, and a switched-off purifier cleans nothing. The five below all run below 25 dB in sleep mode — quieter than a ticking clock — with dimmed or killed displays. We ranked on sleep-mode CADR (how much cleaning survives the silence), because some units go quiet by going useless.
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
Should I sleep with an air purifier on?
Yes — night mode exists for exactly this. Bedroom air quality matters most during your 8 sleeping hours. Pick a unit that drops below 25 dB in sleep mode with display-off, and let it run all night on auto.
Do air purifiers help with hay fever?
Significantly, for indoor relief. Running a HEPA purifier in the bedroom with windows closed during pollen season measurably cuts indoor pollen. Sufferers report better sleep within days. Pair with showering before bed during peak grass pollen (May–July in Ireland).
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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