Head to head

Dyson Purifier Hot+Cool Formaldehyde HP09 vs Levoit Core 400S

They split the 4 rankable specs evenly, so cost decides it: Levoit Core 400S costs $580 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); Levoit Core 400S lists 260 CFM / 442 m³/h (Smoke), 260 CFM (Dust), 260 CFM (Pollen) (Levoit 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); Levoit Core 400S lists 403 sq ft (5 air changes/hr) / 990 sq ft (2 air changes/hr) (Levoit 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); Levoit Core 400S lists Bedrooms, apartments, mid-size living spaces (Levoit 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); Levoit Core 400S lists 3-Stage: Nylon Pre-filter + H13 True HEPA + High-Efficiency Activated Carbon (Levoit 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); Levoit Core 400S lists 6–12 months (Levoit sheet, 2026-09-02).

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

Dyson Purifier Hot+Cool Formaldehyde HP09

$7992 spec wins

Swap

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Levoit Core 300S Smart True HEPA Air Purifier$149 Winix 5500-2 Air Purifier$159 Coway Airmega AP-1512HH Mighty$229 Blueair Blue Pure 311i Max$229 Honeywell HPA300 HEPA Air Purifier$249 Levoit Core 600S Smart True HEPA$299 Blueair Blue Pure 211+ Auto$339 Coway Airmega 250$399 Coway Airmega 400$549 Blueair Protect 7470i$649 Alen BreatheSmart 75i Large Room Air Purifier$749

Levoit Core 400S

$2192 spec wins

Swap

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Buying for

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

Straight answer

Overall: 2 to 2

Tied overall. Levoit Core 400S is cheaper.

The 4 rankable overall specs split 2 to 2.
Saves $580 at list price.

2 Dyson Purifier Hot+Cool Formaldehyde HP094 rankable of 11 specsLevoit Core 400S 2

Deal-breakers

tick what would make you walk away

Over 55 dB on highrow
Louder than normal conversation at full speed.
Trips:Dyson Purifier Hot+Cool Formaldehyde HP09 · 46 dB (Low) – 62 dB (Max)Clear:Levoit Core 400S · 24 dB (Sleep mode) – 52 dB (High mode)
Under 1,000 sq ft coveragerow
Undersized for an open-plan living area.
Trips:Dyson Purifier Hot+Cool Formaldehyde HP09 · 500 sq ft room size with 350° oscillati…Trips:Levoit Core 400S · 403 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)

Levoit

260 CFM / 442 m³/h (Smoke), 260 CFM (Dust), 260 CFM (Pollen)

Coverage area

Dyson

500 sq ft room size with 350° oscillation

Levoit

403 sq ft (5 air changes/hr) / 990 sq ft (2 air changes/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

Levoit Core 400S

Upfront list price$219

3-Yr H13 True HEPA filter (Every 12 months (~$45/yr))+$135

3-Year Estimated Total$354

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

Levoit

360° intake requires 15 in perimeter clearance from walls

Nighttime Sleep Mode Noise

Levels below 25 dB are virtually silent for light sleepers.

Dyson

28 dB night mode with dimmed LCD

Levoit

24 dB quiet sleep mode

Unit Footprint & Dimensions

Dyson

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

Levoit

Mid-sized cylinder (10.8 × 10.8 × 20.5 in; 11.0 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.

Levoit: 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$7992 wins

Levoit Core 400S$2192 wins

Performance Filters Usability & Smart Design & Ownership

11 of 11 attributes differ. Identical rows are dimmed.

Performance

3 differences

Performance specifications. Middle column is Dyson Purifier Hot+Cool Formaldehyde HP09, right column is Levoit Core 400S.
CADR	190 CFM class (Air Multiplier 77 gallons/sec circulation)	260 CFM / 442 m³/h (Smoke), 260 CFM (Dust), 260 CFM (Pollen) (wins this row: higher)
Room size	Medium to large bedrooms, living rooms up to 500 sq ft	Bedrooms, apartments, mid-size living spaces
Coverage area	500 sq ft room size with 350° oscillation (wins this row: higher)	403 sq ft (5 air changes/hr) / 990 sq ft (2 air changes/hr)

Filters

2 differences

Filters specifications. Middle column is Dyson Purifier Hot+Cool Formaldehyde HP09, right column is Levoit Core 400S.
Filter types	360° Glass HEPA H13 + Activated Carbon + Cryptomic Formaldehyde filter	3-Stage: Nylon Pre-filter + H13 True HEPA + High-Efficiency Activated Carbon
Filter life	12 months (HEPA/Carbon) / Permanent Formaldehyde catalyst	6–12 months

Usability & Smart

leads 1-0

Usability & Smart specifications. Middle column is Dyson Purifier Hot+Cool Formaldehyde HP09, right column is Levoit Core 400S.
Noise levels	46 dB (Low) – 62 dB (Max)	24 dB (Sleep mode) – 52 dB (High mode) (wins this row: lower)
Energy consumption	40 W (Purifier mode) / 1,575 W (Heating mode)	38 W max power consumption
Smart features	MyDyson App, voice control via Alexa, Google Assistant, Siri Shortcuts	VeSync Wi-Fi App, Amazon Alexa, Google Assistant voice control
Air quality sensors	Solid-state formaldehyde sensor, PM2.5, PM10, VOC, NO2, Temperature, Humidity	AirSight Plus Laser Dust Sensor with PM2.5 numerical display and 4-color ring

Design & Ownership

leads 1-0

Design & Ownership specifications. Middle column is Dyson Purifier Hot+Cool Formaldehyde HP09, right column is Levoit Core 400S.
Weight	12.6 lb (5.7 kg) (wins this row: lower)	14.1 lb (6.4 kg)
Warranty	2 years	2 years limited warranty

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 Levoit Core 400S source

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

Levoit Core 400S

Smart air purifier with H13 True HEPA filtration, AirSight Plus laser dust sensor, and VeSync app control.

Whisper-quiet 24 dB sleep mode with completely dimmable light display
AirSight Plus laser sensor provides real-time PM2.5 numerical readings
VeSync smartphone app with scheduling, filter life tracking, and voice control

What you give up

Coverage is sized for medium bedrooms and living rooms (under 1,000 sq ft)
Activated carbon layer is a coated sheet rather than heavy pellet bed

Full Levoit Core 400S specs →

Best for each use

Bedrooms

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

Tied on bedrooms. Levoit Core 400S is cheaper.

The 2 rankable bedrooms specs split 1 to 1.
Saves $580 at list price.

Big rooms & allergies

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

Tied on big rooms & allergies. Levoit Core 400S is cheaper.

The 2 rankable big rooms & allergies specs split 1 to 1.
Saves $580 at list price.

Low running cost

Cheap to own: filter life, power draw, warranty

Too close to call on low running cost from the spec sheets.

Filter life: 12 months vs 6–12 months
Energy consumption: 40 W vs 38 W max power consumption

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 sheet Levoit Core 400S spec sheet

Manufacturer pages: Dyson Purifier Hot+Cool Formaldehyde HP09 ↗ · Levoit Core 400S ↗

Common questions

Which is cheaper, the Dyson Purifier Hot+Cool Formaldehyde HP09 or the Levoit Core 400S?

Levoit Core 400S costs $580 less at list price.

What is the biggest catch with the Dyson Purifier Hot+Cool Formaldehyde HP09 or Levoit Core 400S?

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 Dyson Purifier Hot+Cool Formaldehyde HP09 or the Levoit Core 400S?

Tied on bedrooms. Levoit Core 400S is cheaper. The 2 rankable bedrooms specs split 1 to 1. Saves $580 at list price.

What cannot be compared from spec sheets?

Of the 11 specs tracked here, 7 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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