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Appliances head-to-head

Coway Airmega 400vsHoneywell HPA300

4 years apart and the average barely moved: 8.0 for the 2017 Coway Airmega 400, 7.8 for the 2013 Honeywell HPA300. Value is the axis that did move, 8.4 to 7.0.

Coway Airmega 400

Coway

8.0

A heavy-duty purifier sized for the large open rooms most portable units quietly cannot handle.

Price and availability change constantly, so we don't quote them here — the link opens the current Amazon listing.

Honeywell HPA300

Honeywell

7.8

Brute-force air movement for a large room, and it is not remotely subtle about it.

Price and availability change constantly, so we don't quote them here — the link opens the current Amazon listing.

Where they diverge

The widest gap is Value, Honeywell HPA300 ahead 8.4 to 7.0. They come closest on Performance, 9.0 to 8.8. Left of center is Coway Airmega 400, right is Honeywell HPA300.

Coway Airmega 400 versus Honeywell HPA300 — axis scores out of 10Horizontal bar chart of editorial scores out of 10 across 5 axes. Bars for Coway Airmega 400 run left from the axis labels, bars for Honeywell HPA300 run right. Coway Airmega 400: Performance 9.0, Value 7.0, Durability 8.4, Ease of use 8.2, Quietness 7.6. Honeywell HPA300: Performance 8.8, Value 8.4, Durability 8.4, Ease of use 7.0, Quietness 6.4.Coway Airmega 400 (left)Honeywell HPA300 (right)PerformanceCoway Airmega 400 — Performance 9.0 out of 109.0Honeywell HPA300 — Performance 8.8 out of 108.8ValueCoway Airmega 400 — Value 7.0 out of 107.0Honeywell HPA300 — Value 8.4 out of 108.4DurabilityCoway Airmega 400 — Durability 8.4 out of 108.4Honeywell HPA300 — Durability 8.4 out of 108.4Ease of useCoway Airmega 400 — Ease of use 8.2 out of 108.2Honeywell HPA300 — Ease of use 7.0 out of 107.0QuietnessCoway Airmega 400 — Quietness 7.6 out of 107.6Honeywell HPA300 — Quietness 6.4 out of 106.4Editorial score out of 10 — higher is better

Which one to pick

Take the Coway Airmega 400

Leads on Performance, Ease of use and Quietness.

  • A room large enough that smaller units cycle constantly
  • You want a sensor-driven auto mode that reacts to the room instead of a fixed speed
  • Dual-sided intake suits where the unit has to sit

Take the Honeywell HPA300

Leads on Value.

  • Allergy season in a large room, where throughput beats finesse
  • You want mechanical controls that cannot lose firmware
  • Filters stocked in every hardware store

Durability scores identically, so that axis can't break the tie.

What each one gets wrong

Coway Airmega 400

  • Proprietary filters that cost real money every six months
  • Floor space is tight — the footprint is substantial

Honeywell HPA300

  • The unit will be anywhere near where someone sleeps
  • You want auto mode driven by a sensor

Specs, side by side

SpecCoway Airmega 400Honeywell HPA300
CoverageVery large roomsLarge rooms
FilterDual intake, HEPA plus carbonTrue HEPA plus carbon pre-filter
SensorLaser particle sensor, four-color indicator—
Controls—Mechanical buttons, four speeds

Rankings they both appear in

Questions

Is the 2017 Coway Airmega 400 the safer pick over the 2013 Honeywell HPA300?
Coway Airmega 400 leads on Performance, Ease of use and Quietness. If Value matters more to you, take the Honeywell HPA300 instead. The 4-year gap shows in the totals as 8.0 against 7.8.
What does the 2013 model still win?
On Value, yes. That axis still goes to the 2013 model. The 2017 one answers with Performance, Ease of use and Quietness.
Which one ranks higher in "Throughput is cheap in a room nobody sleeps in"?
Coway Airmega 400 sits at #1 in "Throughput is cheap in a room nobody sleeps in", Honeywell HPA300 at #2.