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Appliances head-to-head

Coway Airmega 400vsWinix 5500-2

Same ballpark on the average, 8.0 and 8.1, and nothing alike on the axes: Winix 5500-2 wins Value by 2.0, 9.0 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.

Winix 5500-2

Winix

8.1

The default recommendation in owner forums: true HEPA plus carbon, and filters you can actually find.

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, Winix 5500-2 ahead 9.0 to 7.0. They come closest on Quietness, 7.8 to 7.6. Left of center is Coway Airmega 400, right is Winix 5500-2.

Coway Airmega 400 versus Winix 5500-2 — 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 Winix 5500-2 run right. Coway Airmega 400: Performance 9.0, Value 7.0, Durability 8.4, Ease of use 8.2, Quietness 7.6. Winix 5500-2: Performance 8.2, Value 9.0, Durability 7.6, Ease of use 7.8, Quietness 7.8.Coway Airmega 400 (left)Winix 5500-2 (right)PerformanceCoway Airmega 400 — Performance 9.0 out of 109.0Winix 5500-2 — Performance 8.2 out of 108.2ValueCoway Airmega 400 — Value 7.0 out of 107.0Winix 5500-2 — Value 9.0 out of 109.0DurabilityCoway Airmega 400 — Durability 8.4 out of 108.4Winix 5500-2 — Durability 7.6 out of 107.6Ease of useCoway Airmega 400 — Ease of use 8.2 out of 108.2Winix 5500-2 — Ease of use 7.8 out of 107.8QuietnessCoway Airmega 400 — Quietness 7.6 out of 107.6Winix 5500-2 — Quietness 7.8 out of 107.8Editorial score out of 10 — higher is better

Which one to pick

Take the Coway Airmega 400

Leads on Performance, Durability and Ease of use.

  • 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 Winix 5500-2

Leads on Value and Quietness.

  • Cooking smells and smoke, where the carbon stage earns its place
  • You want replacement filters from more than one supplier
  • Auto mode that responds to actual air quality

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

Winix 5500-2

  • You want the ionizer permanently gone rather than switched off each time
  • A visible control panel light in a dark bedroom bothers you

Specs, side by side

SpecCoway Airmega 400Winix 5500-2
CoverageVery large rooms—
FilterDual intake, HEPA plus carbonTrue HEPA plus washable carbon
SensorLaser particle sensor, four-color indicatorAuto mode with air quality light
Extra—PlasmaWave, switchable

Rankings they both appear in

Questions

Only 0.1 separates them. What breaks the tie?
Value does, at 9.0 against 7.0. That axis covers what the same money buys elsewhere. Winix 5500-2 leads on Value and Quietness. If Performance, Durability and Ease of use matter more to you, take the Coway Airmega 400 instead.
Why are the totals this close?
The total is the plain average of the 5 Appliances axes, so opposite results cancel. Coway Airmega 400 averages 8.0 and Winix 5500-2 averages 8.1, a gap of 0.1, while the individual axes run as far apart as 2.0.
Which one ranks higher in "Recompute a purifier's coverage and it shrinks"?
Winix 5500-2 sits at #2 in "Recompute a purifier's coverage and it shrinks", Coway Airmega 400 at #3.