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Dyson Purifier Hot+Cool Formaldehyde HP09 vs Honeywell HPA300 HEPA Air Purifier

They split the 6 rankable specs evenly, so cost decides it: Honeywell HPA300 HEPA Air Purifier costs $550 less.

Catalog as of September 1, 2026

Why, in numbers

  • CADR: Dyson Purifier Hot+Cool Formaldehyde HP09 lists 190 CFM class (Air Multiplier 77 gallons/sec circulation) (Dyson sheet, 2026-09-02); Honeywell HPA300 HEPA Air Purifier lists 300 CFM (Smoke), 320 CFM (Dust), 300 CFM (Pollen) (Honeywell sheet, 2026-09-02).
  • Coverage area: Dyson Purifier Hot+Cool Formaldehyde HP09 lists 500 sq ft room size with 350° oscillation (Dyson sheet, 2026-09-02); Honeywell HPA300 HEPA Air Purifier lists 465 sq ft (4.8 air changes/hr) / 2,250 sq ft (1 air change/hr) (Honeywell sheet, 2026-09-02).
  • Room size: Dyson Purifier Hot+Cool Formaldehyde HP09 lists Medium to large bedrooms, living rooms up to 500 sq ft (Dyson sheet, 2026-09-02); Honeywell HPA300 HEPA Air Purifier lists Extra large rooms, master suites, open spaces up to 465 sq ft (4.8 ACH) (Honeywell sheet, 2026-09-02).
  • Filter types: Dyson Purifier Hot+Cool Formaldehyde HP09 lists 360° Glass HEPA H13 + Activated Carbon + Cryptomic Formaldehyde filter (Dyson sheet, 2026-09-02); Honeywell HPA300 HEPA Air Purifier lists Type A Activated Carbon Pre-filter + 3× Type R True HEPA filters (Honeywell sheet, 2026-09-02).
  • Filter life: Dyson Purifier Hot+Cool Formaldehyde HP09 lists 12 months (HEPA/Carbon) / Permanent Formaldehyde catalyst (Dyson sheet, 2026-09-02); Honeywell HPA300 HEPA Air Purifier lists 3 months (Pre-filter) / 12 months (True HEPA filters) (Honeywell sheet, 2026-09-02).

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

Dyson Purifier Hot+Cool Formaldehyde HP09
$7993 spec wins
Swap

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Honeywell HPA300 HEPA Air Purifier
$2493 spec wins
Swap

Compare a different air purifier

Levoit Core 300S Smart True HEPA Air Purifier$149Winix 5500-2 Air Purifier$159Levoit Core 400S$219Coway Airmega AP-1512HH Mighty$229Blueair Blue Pure 311i Max$229Levoit Core 600S Smart True HEPA$299Blueair Blue Pure 211+ Auto$339Coway Airmega 250$399Coway Airmega 400$549Blueair Protect 7470i$649Alen BreatheSmart 75i Large Room Air Purifier$749

Buying for

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

Straight answer

Overall: 3 to 3

Tied overall. Honeywell HPA300 HEPA Air Purifier is cheaper.

  • The 6 rankable overall specs split 3 to 3.
  • Saves $550 at list price.
3 Dyson Purifier Hot+Cool Formaldehyde HP096 rankable of 11 specsHoneywell HPA300 HEPA Air Purifier 3

Deal-breakers

tick what would make you walk away

  • row

    Louder than normal conversation at full speed.

    Trips:Dyson Purifier Hot+Cool Formaldehyde HP09 · 46 dB (Low) – 62 dB (Max)Trips:Honeywell HPA300 HEPA Air Purifier · 38 dB (Low) – 58 dB (Turbo)
  • row

    Undersized for an open-plan living area.

    Trips:Dyson Purifier Hot+Cool Formaldehyde HP09 · 500 sq ft room size with 350° oscillati…Trips:Honeywell HPA300 HEPA Air Purifier · 465 sq ft

At a glance

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

2 of 2 differ

CADR

Dyson

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

Honeywell

300 CFM (Smoke), 320 CFM (Dust), 300 CFM (Pollen)

Coverage area

Dyson

500 sq ft room size with 350° oscillation

Honeywell

465 sq ft (4.8 air changes/hr) / 2,250 sq ft (1 air change/hr)

True 3-Year Cost of Ownership (TCO)

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

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

Honeywell HPA300 HEPA Air Purifier

Upfront list price$249
3-Yr 3x HRF-R3 HEPA + 4x Pre-filters (Annual full filter set (~$65/yr))+$195
3-Year Estimated Total$444

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.

Dyson

Cylindrical base: needs 12 in airflow clearance around unit

Honeywell

Front grille intake: can back up close to baseboards

Nighttime Sleep Mode Noise

Levels below 25 dB are virtually silent for light sleepers.

Dyson

28 dB night mode with dimmed LCD

Honeywell

30 dB lowest fan speed (noticeable background white noise)

Unit Footprint & Dimensions

Dyson

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

Honeywell

Large commercial-grade shell (20.8 × 22.3 × 10.8 in; 17.0 lb)

The 90-Day Owner Regret Check

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

Post-Purchase Truths

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.

Honeywell: 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 Purifier Hot+Cool Formaldehyde HP09$7993 wins
Honeywell HPA300 HEPA Air Purifier$2493 wins

Performance

3 differences
Performance specifications. Middle column is Dyson Purifier Hot+Cool Formaldehyde HP09, right column is Honeywell HPA300 HEPA Air Purifier.
CADR190 CFM class (Air Multiplier 77 gallons/sec circulation)300 CFM (Smoke), 320 CFM (Dust), 300 CFM (Pollen) (wins this row: higher)
Room sizeMedium to large bedrooms, living rooms up to 500 sq ftExtra large rooms, master suites, open spaces up to 465 sq ft (4.8 ACH)
Coverage area500 sq ft room size with 350° oscillation (wins this row: higher)465 sq ft (4.8 air changes/hr) / 2,250 sq ft (1 air change/hr)

Filters

leads 1-0
Filters specifications. Middle column is Dyson Purifier Hot+Cool Formaldehyde HP09, right column is Honeywell HPA300 HEPA Air Purifier.
Filter types360° Glass HEPA H13 + Activated Carbon + Cryptomic Formaldehyde filterType A Activated Carbon Pre-filter + 3× Type R True HEPA filters
Filter life12 months (HEPA/Carbon) / Permanent Formaldehyde catalyst (wins this row: higher)3 months (Pre-filter) / 12 months (True HEPA filters)

Usability & Smart

leads 1-0
Usability & Smart specifications. Middle column is Dyson Purifier Hot+Cool Formaldehyde HP09, right column is Honeywell HPA300 HEPA Air Purifier.
Noise levels46 dB (Low) – 62 dB (Max)38 dB (Low) – 58 dB (Turbo) (wins this row: lower)
Energy consumption40 W (Purifier mode) / 1,575 W (Heating mode)130 W max power consumption
Smart featuresMyDyson App, voice control via Alexa, Google Assistant, Siri ShortcutsNo (manual touch controls with 2/4/8 hr auto-off timer)
Air quality sensorsSolid-state formaldehyde sensor, PM2.5, PM10, VOC, NO2, Temperature, HumidityNo automated air quality sensors (filter replacement indicators)

Design & Ownership

2 differences
Design & Ownership specifications. Middle column is Dyson Purifier Hot+Cool Formaldehyde HP09, right column is Honeywell HPA300 HEPA Air Purifier.
Weight12.6 lb (5.7 kg) (wins this row: lower)17.0 lb (7.7 kg)
Warranty2 years5 years manufacturer limited warranty (wins this row: higher)
Most rows are from the official spec sheet. Marked rows are other published figures or our summary, not lab tests we ran.
Dyson Purifier Hot+Cool Formaldehyde HP09 source (opens in a new tab)Honeywell HPA300 HEPA Air Purifier source (opens in a new tab)

Which one should you buy

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 →

Pick this one if

Honeywell HPA300 HEPA Air Purifier

Extra-large room True HEPA air purifier with Turbo Clean mode, dual-stage filtration, and AHAM Verifide CADR ratings for large rooms.

  • Powerful high-volume CADR (300+ CFM) for large rooms up to 465 sq ft
  • Certified True HEPA captures 99.97% of airborne particles
  • Durable workhorse build with touch-button controls

What you give up

  • High power consumption (up to 130W on Turbo)
  • No Wi-Fi app or smart automated air quality sensors
Full Honeywell HPA300 HEPA Air Purifier specs →

Best for each use

Bedrooms

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

Tied on bedrooms. Honeywell HPA300 HEPA Air Purifier is cheaper.

  • The 2 rankable bedrooms specs split 1 to 1.
  • Saves $550 at list price.

Big rooms & allergies

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

For big rooms & allergies, buy the Dyson Purifier Hot+Cool Formaldehyde HP09.

  • Leads 2 of 3 rankable big rooms & allergies specs; Honeywell HPA300 HEPA Air Purifier takes 1.
  • Coverage area: 500 sq ft room size with 350° oscillation vs 465 sq ft
  • Filter life: 12 months vs 3 months
  • Honeywell HPA300 HEPA Air Purifier is $550 cheaper. Pay the difference only if coverage area matters to you.

Low running cost

Cheap to own: filter life, power draw, warranty

Tied on low running cost. Honeywell HPA300 HEPA Air Purifier is cheaper.

  • The 2 rankable low running cost specs split 1 to 1.
  • Saves $550 at list price.

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.

Dyson Purifier Hot+Cool Formaldehyde HP09 spec sheetHoneywell HPA300 HEPA Air Purifier spec sheet

Manufacturer pages: Dyson Purifier Hot+Cool Formaldehyde HP09 ↗ · Honeywell HPA300 HEPA Air Purifier ↗

Common questions

Which is cheaper, the Dyson Purifier Hot+Cool Formaldehyde HP09 or the Honeywell HPA300 HEPA Air Purifier?

Honeywell HPA300 HEPA Air Purifier costs $550 less at list price.

What is the biggest catch with the Dyson Purifier Hot+Cool Formaldehyde HP09 or Honeywell HPA300 HEPA Air Purifier?

Both has this deal-breaker: over 55 dB on high. Louder than normal conversation at full speed.

Which is better for bedrooms, the Dyson Purifier Hot+Cool Formaldehyde HP09 or the Honeywell HPA300 HEPA Air Purifier?

Tied on bedrooms. Honeywell HPA300 HEPA Air Purifier is cheaper. The 2 rankable bedrooms specs split 1 to 1. Saves $550 at list price.

What cannot be compared from spec sheets?

Of the 11 specs tracked here, 5 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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