Head to head

Blueair Protect 7470i vs Dyson Purifier Hot+Cool Formaldehyde HP09

Blueair Protect 7470i leads 4 to 1 on the 5 rankable specs and costs $150 less, which makes it the straightforward pick.

Catalog as of September 1, 2026

Why, in numbers

CADR: Blueair Protect 7470i lists 270 CFM (Smoke), 275 CFM (Dust), 280 CFM (Pollen) (Blueair sheet, 2026-09-02); Dyson Purifier Hot+Cool Formaldehyde HP09 lists 190 CFM class (Air Multiplier 77 gallons/sec circulation) (Dyson sheet, 2026-09-02).
Coverage area: Blueair Protect 7470i lists 1,035 sq ft (2 air changes/hr) / 418 sq ft (5 air changes/hr) (Blueair sheet, 2026-09-02); Dyson Purifier Hot+Cool Formaldehyde HP09 lists 500 sq ft room size with 350° oscillation (Dyson sheet, 2026-09-02).
Room size: Blueair Protect 7470i lists Master bedrooms, living areas up to 418 sq ft (5 ACH) (Blueair sheet, 2026-09-02); Dyson Purifier Hot+Cool Formaldehyde HP09 lists Medium to large bedrooms, living rooms up to 500 sq ft (Dyson sheet, 2026-09-02).
Filter types: Blueair Protect 7470i lists SmartFilter with Smart RFID chip (HEPASilent Ultra + Activated Carbon) (Blueair sheet, 2026-09-02); Dyson Purifier Hot+Cool Formaldehyde HP09 lists 360° Glass HEPA H13 + Activated Carbon + Cryptomic Formaldehyde filter (Dyson sheet, 2026-09-02).
Filter life: Blueair Protect 7470i lists 6–12 months with real-time algorithm filter tracking (Blueair sheet, 2026-09-02); Dyson Purifier Hot+Cool Formaldehyde HP09 lists 12 months (HEPA/Carbon) / Permanent Formaldehyde catalyst (Dyson sheet, 2026-09-02).

Manufacturer list price, not a live offer. Confirm current pricing before you buy.

Blueair Protect 7470i

$6494 spec wins

Swap

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Dyson Purifier Hot+Cool Formaldehyde HP09

$7991 spec win

Swap

Compare a different air purifier

Buying for

Every rankable spec counts once. Pick a lens to score only what matters for your air purifier.

Straight answer

Overall: 4 to 1

Buy the Blueair Protect 7470i.

Leads 4 of 5 rankable overall specs; Dyson Purifier Hot+Cool Formaldehyde HP09 takes 1.
CADR: 270 CFM vs 190 CFM class
Coverage area: 1,035 sq ft vs 500 sq ft room size with 350° oscillation
It is also $150 cheaper.

Check first: the Blueair Protect 7470i weighs over 25 lb (11 kg). Tick them under deal-breakers if that rules it out.

4 Blueair Protect 7470i5 rankable of 11 specsDyson Purifier Hot+Cool Formaldehyde HP09 1

Deal-breakers

tick what would make you walk away

Over 55 dB on highrow
Louder than normal conversation at full speed.
Clear:Blueair Protect 7470i · 22 dB (Low) – 45 dB (High)Trips:Dyson Purifier Hot+Cool Formaldehyde HP09 · 46 dB (Low) – 62 dB (Max)
Under 1,000 sq ft coveragerow
Undersized for an open-plan living area.
Clear:Blueair Protect 7470i · 1,035 sq ftTrips:Dyson Purifier Hot+Cool Formaldehyde HP09 · 500 sq ft room size with 350° oscillati…
Over 25 lb (11 kg)row
Hard to move between rooms.
Trips:Blueair Protect 7470i · 27.6 lbClear:Dyson Purifier Hot+Cool Formaldehyde HP09 · 12.6 lb

At a glance

The handful of numbers that decide most purchases in this category.

2 of 2 differ

CADR

Blueair

270 CFM (Smoke), 275 CFM (Dust), 280 CFM (Pollen)

Dyson

190 CFM class (Air Multiplier 77 gallons/sec circulation)

Coverage area

Blueair

1,035 sq ft (2 air changes/hr) / 418 sq ft (5 air changes/hr)

Dyson

500 sq ft room size with 350° oscillation

True 3-Year Cost of Ownership (TCO)

Upfront price + 3 years of consumables, fees & essential add-ons

Blueair Protect 7470i

Upfront list price$649

3-Yr SmartFilter RFID dual-layer (Every 12 months (~$80/yr))+$240

3-Year Estimated Total$889

Dyson Purifier Hot+Cool Formaldehyde HP09

Upfront list price$799

3-Yr 360° Combi Glass HEPA + Carbon (Every 12 months (~$80/yr))+$240

3-Year Estimated Total$1,039

Room Placement & Bedroom Noise Check

Physical clearance required for airflow, wall placement, and bedroom noise levels.

Ergonomic & Spatial Check

Wall Clearance Required

Cylindrical 360° filters cannot sit flush against walls without choking intake.

Blueair

Requires 12 in perimeter airflow space

Dyson

Cylindrical base: needs 12 in airflow clearance around unit

Nighttime Sleep Mode Noise

Levels below 25 dB are virtually silent for light sleepers.

Blueair

Standard sleep speed

Dyson

28 dB night mode with dimmed LCD

Unit Footprint & Dimensions

Blueair

Standard room purifier footprint

Dyson

Bladeless oval loop (30.0 × 8.1 × 8.1 in; 12.6 lb; heats & cools)

The 90-Day Owner Regret Check

Documented ergonomic quirks, hardware annoyances, and maintenance realities reported by real owners.

Post-Purchase Truths

Blueair: What to watch for

Maintenance
Requires periodic filter replacements to maintain airflow and odor capture.
Activated carbon and HEPA media gradually saturate, needing replacement once or twice yearly depending on air pollution and pet shedding.

Dyson: What to watch for

Hidden Cost
High replacement filter cost (~$80 each).
The catalytic formaldehyde combo filter is significantly more expensive than standard box purifiers from Levoit or Coway.

Blueair Protect 7470i$6494 wins

Dyson Purifier Hot+Cool Formaldehyde HP09$7991 win

Performance Filters Usability & Smart Design & Ownership

11 of 11 attributes differ. Identical rows are dimmed.

Performance

leads 2-0

Performance specifications. Middle column is Blueair Protect 7470i, right column is Dyson Purifier Hot+Cool Formaldehyde HP09.
CADR	270 CFM (Smoke), 275 CFM (Dust), 280 CFM (Pollen) (wins this row: higher)	190 CFM class (Air Multiplier 77 gallons/sec circulation)
Room size	Master bedrooms, living areas up to 418 sq ft (5 ACH)	Medium to large bedrooms, living rooms up to 500 sq ft
Coverage area	1,035 sq ft (2 air changes/hr) / 418 sq ft (5 air changes/hr) (wins this row: higher)	500 sq ft room size with 350° oscillation

Filters

2 differences

Filters specifications. Middle column is Blueair Protect 7470i, right column is Dyson Purifier Hot+Cool Formaldehyde HP09.
Filter types	SmartFilter with Smart RFID chip (HEPASilent Ultra + Activated Carbon)	360° Glass HEPA H13 + Activated Carbon + Cryptomic Formaldehyde filter
Filter life	6–12 months with real-time algorithm filter tracking	12 months (HEPA/Carbon) / Permanent Formaldehyde catalyst

Usability & Smart

leads 1-0

Usability & Smart specifications. Middle column is Blueair Protect 7470i, right column is Dyson Purifier Hot+Cool Formaldehyde HP09.
Noise levels	22 dB (Low) – 45 dB (High) (wins this row: lower)	46 dB (Low) – 62 dB (Max)
Energy consumption	43 W max power (Energy Star certified)	40 W (Purifier mode) / 1,575 W (Heating mode)
Smart features	Blueair App, Alexa, Google Home, GermShield 24/7 background mode	MyDyson App, voice control via Alexa, Google Assistant, Siri Shortcuts
Air quality sensors	Laser particle sensor (PM1, PM2.5, PM10), TVOC, Temp, Humidity	Solid-state formaldehyde sensor, PM2.5, PM10, VOC, NO2, Temperature, Humidity

Design & Ownership

2 differences

Design & Ownership specifications. Middle column is Blueair Protect 7470i, right column is Dyson Purifier Hot+Cool Formaldehyde HP09.
Weight	27.6 lb (12.5 kg)	12.6 lb (5.7 kg) (wins this row: lower)
Warranty	5 years (with product registration) (wins this row: higher)	2 years

Most rows are from the official spec sheet. Marked rows are other published figures or our summary, not lab tests we ran.

Blueair Protect 7470i source Dyson Purifier Hot+Cool Formaldehyde HP09 source

Which one should you buy

Pick this one if

Blueair Protect 7470i

HEPASilent Ultra smart air purifier with 24/7 GermShield bacterial protection and SpiralAir 360 vents.

HEPASilent Ultra electrostatic + mechanical filtration kills 99% of germs
SpiralAir omnidirectional airflow distributes clean air evenly
Premium matte build with intuitive LCD air quality touchscreen

What you give up

SmartFilter replacements are relatively costly
Heavier metallic construction

Full Blueair Protect 7470i specs →

Pick this one if

Dyson Purifier Hot+Cool Formaldehyde HP09

3-in-1 purifier, ceramic space heater, and cooling fan with solid-state catalytic formaldehyde sensor.

Combines HEPA H13 purification, fast ceramic heating, and cooling fan in one
Destroys formaldehyde continuously without filter replacement
Fully sealed whole-machine HEPA H13 standard prevents bypass

What you give up

CADR airflow is lower than dedicated box purifiers
Expensive upfront purchase price

Full Dyson Purifier Hot+Cool Formaldehyde HP09 specs →

Best for each use

Bedrooms

Quiet nights: low-speed noise, sleep mode, schedules from your phone

Tied on bedrooms. Blueair Protect 7470i is cheaper.

The 2 rankable bedrooms specs split 1 to 1.
Saves $150 at list price.

Big rooms & allergies

Open-plan rooms or allergies: CADR, coverage, filter grade

For big rooms & allergies, buy the Blueair Protect 7470i.

Leads 2 of 2 rankable big rooms & allergies specs.
CADR: 270 CFM vs 190 CFM class
Coverage area: 1,035 sq ft vs 500 sq ft room size with 350° oscillation
It is also $150 cheaper.

Low running cost

Cheap to own: filter life, power draw, warranty

Too close to call on low running cost from the spec sheets. Only warranty is rankable here.

Filter life: 6–12 months with real-time algorithm filter… vs 12 months
Energy consumption: 43 W max power vs 40 W

Every answer above is scored from published figures. A lens uses only the rows that matter for that use, including marked rows that are not on the official sheet. Switch lenses interactively in the panel above.

Done deciding?

Open the full standalone spec sheet for either device.

Blueair Protect 7470i spec sheet Dyson Purifier Hot+Cool Formaldehyde HP09 spec sheet

Manufacturer pages: Blueair Protect 7470i ↗ · Dyson Purifier Hot+Cool Formaldehyde HP09 ↗

Common questions

Which is cheaper, the Blueair Protect 7470i or the Dyson Purifier Hot+Cool Formaldehyde HP09?

Blueair Protect 7470i costs $150 less at list price.

What is the biggest catch with the Blueair Protect 7470i or Dyson Purifier Hot+Cool Formaldehyde HP09?

Dyson Purifier Hot+Cool Formaldehyde HP09 has this deal-breaker: over 55 dB on high. Louder than normal conversation at full speed.

Which is better for bedrooms, the Blueair Protect 7470i or the Dyson Purifier Hot+Cool Formaldehyde HP09?

Tied on bedrooms. Blueair Protect 7470i is cheaper. The 2 rankable bedrooms specs split 1 to 1. Saves $150 at list price.

What cannot be compared from spec sheets?

Of the 11 specs tracked here, 6 are descriptive and cannot be ranked on numbers alone. Spec sheets also cannot measure subjective factors like build quality, real-world performance, or comfort.

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