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Coway Airmega 400 vs Honeywell HPA300 HEPA Air Purifier

Coway Airmega 400 leads 4 to 1 on the 5 rankable specs, but Honeywell HPA300 HEPA Air Purifier costs $300 less.

Catalog as of September 1, 2026

Why, in numbers

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

Coway Airmega 400
$5494 spec wins
Swap

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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$399Blueair Protect 7470i$649Alen BreatheSmart 75i Large Room Air Purifier$749Dyson Purifier Hot+Cool Formaldehyde HP09$799
Honeywell HPA300 HEPA Air Purifier
$2491 spec win
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$399Blueair Protect 7470i$649Alen BreatheSmart 75i Large Room Air Purifier$749Dyson Purifier Hot+Cool Formaldehyde HP09$799

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 Coway Airmega 400.

  • Leads 4 of 5 rankable overall specs; Honeywell HPA300 HEPA Air Purifier takes 1.
  • CADR: 350 CFM vs 300 CFM
  • Coverage area: 1,560 sq ft vs 465 sq ft
  • Honeywell HPA300 HEPA Air Purifier is $300 cheaper. Pay the difference only if cadr matters to you.

Check first: the Coway Airmega 400 has no Wi-Fi app. Tick them under deal-breakers if that rules it out.

4 Coway Airmega 4005 rankable of 11 specsHoneywell HPA300 HEPA Air Purifier 1

Deal-breakers

tick what would make you walk away

  • row

    No schedules or remote control from your phone.

    Trips:Coway Airmega 400 · Smart Auto Mode + Eco ModeClear:Honeywell HPA300 HEPA Air Purifier · No (manual touch controls with 2/4/8 hr…
  • row

    Louder than normal conversation at full speed.

    Clear:Coway Airmega 400 · 22 dB (Sleep mode) – 52 dB (Max speed)Trips:Honeywell HPA300 HEPA Air Purifier · 38 dB (Low) – 58 dB (Turbo)
  • row

    Undersized for an open-plan living area.

    Clear:Coway Airmega 400 · 1,560 sq ftTrips: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

Coway

350 CFM (Smoke), 328 CFM (Dust), 400 CFM (Pollen)

Honeywell

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

Coverage area

Coway

1,560 sq ft (2 air changes/hr) / 780 sq ft (4 air changes/hr)

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

Coway Airmega 400

Upfront list price$549
3-Yr Dual Max2 Filter Set (Every 12 months (~$90/yr set))+$270
3-Year Estimated Total$819

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.

Coway

Requires 12 in perimeter airflow space

Honeywell

Front grille intake: can back up close to baseboards

Nighttime Sleep Mode Noise

Levels below 25 dB are virtually silent for light sleepers.

Coway

Standard sleep speed

Honeywell

30 dB lowest fan speed (noticeable background white noise)

Unit Footprint & Dimensions

Coway

Standard room purifier footprint

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

Coway: 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.

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.

Coway Airmega 400$5494 wins
Honeywell HPA300 HEPA Air Purifier$2491 win

Performance

leads 2-0
Performance specifications. Middle column is Coway Airmega 400, right column is Honeywell HPA300 HEPA Air Purifier.
CADR350 CFM (Smoke), 328 CFM (Dust), 400 CFM (Pollen) (wins this row: higher)300 CFM (Smoke), 320 CFM (Dust), 300 CFM (Pollen)
Room sizeLarge living rooms, open floor plans, officesExtra large rooms, master suites, open spaces up to 465 sq ft (4.8 ACH)
Coverage area1,560 sq ft (2 air changes/hr) / 780 sq ft (4 air changes/hr) (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 Coway Airmega 400, right column is Honeywell HPA300 HEPA Air Purifier.
Filter typesWashable Pre-filter + Max2 Filter (True HEPA + Activated Carbon)Type A Activated Carbon Pre-filter + 3× Type R True HEPA filters
Filter life12 months (Max2 filter) / Washable pre-filters (wins this row: higher)3 months (Pre-filter) / 12 months (True HEPA filters)

Usability & Smart

leads 1-0
Usability & Smart specifications. Middle column is Coway Airmega 400, right column is Honeywell HPA300 HEPA Air Purifier.
Noise levels22 dB (Sleep mode) – 52 dB (Max speed) (wins this row: lower)38 dB (Low) – 58 dB (Turbo)
Energy consumption66 W max power consumption (Energy Star Certified)130 W max power consumption
Smart featuresSmart Auto Mode + Eco Mode (no Wi-Fi app)No (manual touch controls with 2/4/8 hr auto-off timer)
Air quality sensorsReal-time particle sensor with colorful LED ring indicatorNo automated air quality sensors (filter replacement indicators)

Design & Ownership

leads 1-0
Design & Ownership specifications. Middle column is Coway Airmega 400, right column is Honeywell HPA300 HEPA Air Purifier.
Weight24.7 lb (11.2 kg)17.0 lb (7.7 kg) (wins this row: lower)
Warranty5 years limited motor / 1 year electronic parts5 years manufacturer limited warranty
Most rows are from the official spec sheet. Marked rows are other published figures or our summary, not lab tests we ran.
Coway Airmega 400 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

Coway Airmega 400

Dual-suction large room air purifier with Max2 HEPA and activated carbon filtration covering 1,560 sq ft.

  • Massive CADR cleans up to 1,560 sq ft twice per hour
  • Dual-sided air intake with combined True HEPA and carbon filters
  • Smart Eco mode turns off fan when air remains clean for 30 minutes

What you give up

  • Cube design has a large floor footprint
  • No mobile app connectivity on the non-S model
Full Coway Airmega 400 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 $300 at list price.

Big rooms & allergies

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

For big rooms & allergies, buy the Coway Airmega 400.

  • Leads 3 of 3 rankable big rooms & allergies specs.
  • CADR: 350 CFM vs 300 CFM
  • Coverage area: 1,560 sq ft vs 465 sq ft
  • Honeywell HPA300 HEPA Air Purifier is $300 cheaper. Pay the difference only if cadr matters to you.

Low running cost

Cheap to own: filter life, power draw, warranty

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

  • Energy consumption: 66 W max power consumption vs 130 W max power consumption
  • Warranty: 5 years limited motor / 1 year electronic… vs 5 years manufacturer limited warranty

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.

Coway Airmega 400 spec sheetHoneywell HPA300 HEPA Air Purifier spec sheet

Manufacturer pages: Coway Airmega 400 ↗ · Honeywell HPA300 HEPA Air Purifier ↗

Common questions

Which is cheaper, the Coway Airmega 400 or the Honeywell HPA300 HEPA Air Purifier?

Honeywell HPA300 HEPA Air Purifier costs $300 less at list price.

What is the biggest catch with the Coway Airmega 400 or Honeywell HPA300 HEPA Air Purifier?

Coway Airmega 400 has this deal-breaker: no Wi-Fi app. No schedules or remote control from your phone.

Which is better for bedrooms, the Coway Airmega 400 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 $300 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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