Coway
Coway Airmega 400
Air purifiers
$549List price
Explore this product Your shortlist, side by side
Coway Airmega 400 vs Honeywell HPA300 HEPA Air Purifier
Find the differences that matter for your next decision.
Honeywell
Honeywell HPA300 HEPA Air Purifier
Air purifiers
$249List price
Explore this product What matters most to you?
Start with all rankable specifications, or focus on a particular use.
Your starting point
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
How we reached this
We compare the published specifications relevant to your priority. Each rankable specification counts once; your selected requirements can rule a product out. This is a guide to the numbers, not a laboratory performance score.
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.
The trade-off to know
Check first: the Coway Airmega 400 has no Wi-Fi app. Tick them under deal-breakers if that rules it out.
Look at the differences ↓Refine your requirements
What would rule one out?
Side by side
The differences, in detail.
Start with the key specs, then explore as much as you need.
| What you’re comparing | Coway Airmega 400 | Honeywell HPA300 HEPA Air Purifier |
|---|---|---|
| CADRPerformance | 350 CFM (Smoke), 328 CFM (Dust), 400 CFM (Pollen) | 300 CFM (Smoke), 320 CFM (Dust), 300 CFM (Pollen) |
| Room sizePerformance | Large living rooms, open floor plans, offices | Extra large rooms, master suites, open spaces up to 465 sq ft (4.8 ACH) |
| Coverage areaPerformance | 1,560 sq ft (2 air changes/hr) / 780 sq ft (4 air changes/hr) | 465 sq ft (4.8 air changes/hr) / 2,250 sq ft (1 air change/hr) |
| Filter typesFilters | Washable Pre-filter + Max2 Filter (True HEPA + Activated Carbon) | Type A Activated Carbon Pre-filter + 3× Type R True HEPA filters |
| Filter lifeFilters | 12 months (Max2 filter) / Washable pre-filters | 3 months (Pre-filter) / 12 months (True HEPA filters) |
Showing 5 of 11 specifications. Missing values stay unlisted. About the sources
Both sides of the decision
What you gain. What you give up.
Coway Airmega 400
Reasons to choose it
- 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
Worth considering
- Cube design has a large floor footprint
- No mobile app connectivity on the non-S model
Honeywell HPA300 HEPA Air Purifier
Reasons to choose it
- 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
Worth considering
- High power consumption (up to 130W on Turbo)
- No Wi-Fi app or smart automated air quality sensors
Beyond the spec sheet
Living with your choice.
Explore the ownership details available for this pair.
What three years could cost
Coway Airmega 400
3-Year Estimated Total$819
Honeywell HPA300 HEPA Air Purifier
3-Year Estimated Total$444
Room Placement & Bedroom Noise Check
Physical clearance required for airflow, wall placement, and bedroom noise levels.
Wall Clearance Required
Coway
Requires 12 in perimeter airflow space
Honeywell
Front grille intake: can back up close to baseboards
Nighttime Sleep Mode Noise
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)
Everyday ownership notes
Documented ergonomic quirks, hardware annoyances, and maintenance realities reported by real owners.
Coway: What to watch for
- Maintenance
Requires periodic filter replacements to maintain airflow and odor capture.
Honeywell: What to watch for
- Maintenance
Requires periodic filter replacements to maintain airflow and odor capture.
Know what’s behind the comparison
Published specs. Visible sources.
Clinchmark compares manufacturer specifications and other published information. We have not independently lab-tested these products. Editorial assessments and unknown values are identified in the specification details.
Catalog snapshot: September 1, 2026. Prices, availability, and provider terms can change.
Still weighing it up?
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.