Coway Airmega 400S vs Molekule PECOAir+
Two of the large-room air purifiers in our best large-room air purifiers: coway, blueair, levoit, winix, iqair & more comparison, lined up spec by spec. Every figure comes from the manufacturer pages linked below, and the scores use the same published formula as the full ranking.
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Best for: Coway's large-room classic with app control
Check price at AmazonBest for: PECO + HEPA filtration with CO2 and TVOC sensors
Check price at AmazonSpec-by-spec comparison
Green marks the better published figure. "Not listed" means the manufacturer doesn't publish it.
| Spec | Coway Airmega 400S | Molekule PECOAir+ | Weight |
|---|---|---|---|
| Smoke CADRSmoke is the hardest of the three AHAM CADR tests, so we use it when listed. Levoit lists one headline CADR, and we use that. Shark, Honeywell, Molekule and IQAir don't publish an AHAM CADR, so those cells are blank and score at the lowest published value in the category. | 328 CFM | Not listed | 40% |
| CADR per wattComputed by us: smoke CADR divided by the maker's rated or maximum power. Higher means more clean air for the electricity, which matters for a machine that runs all day. | 5 CFM/W | Not listed | 15% |
| Quietest settingThe lowest listed noise level, usually sleep mode. Makers measure at different distances, so treat differences of 1–2 dB as a tie. | 22 dB | 32 dB | 10% |
| Loudest settingNoise at top speed, which is what you hear when you run it hard for smoke or cooking. Left blank when the maker lists only the minimum. | 52 dB | 55 dB | 10% |
| Carbon or odor stage includedYes when the filter in the box includes an activated-carbon or deodorization stage, per the maker. HEPA alone traps particles but not odors or gases. | Yes | Yes | 10% |
| Main filter lifeThe maker's 'up to' figure for the main HEPA filter. Makers assume different daily run times (noted on each product), so this is a rough guide to running costs. | 12 months | 6 months | 15% |
| CADR (smoke / dust / pollen) | 328 / 328 / 400 | Not listed | info |
| Coverage | 3,120 ft² at 1 air change/hr; 1,560 ft² at 2 | Up to 875 ft² | info |
| Filter | Washable pre-filter + Max2 set (activated carbon + HEPA) | 2 × PECO-HEPA Advanced (H14-grade HEPA media + activated carbon + photocatalyst) | info |
| Filter life | Max2: 1 year | Replace every six months | info |
| Noise | 22–52 dB(A) | 32–55 dBA | info |
| Power | 66 W | Not listed | info |
| App | IoCare+ app, scheduler | Not listed | info |
| Weight | 24.7 lb | 17.5 lb | info |
| AHAM CADR | Not listed | Not published by the maker | info |
| Sensors | Not listed | PM1.0–10, humidity/temperature, dual TVOC, CO2 | info |
| AirPick score | 4.8/10 | 2.0/10 | 100% |
Where each one comes out ahead
Coway Airmega 400S
Better published figure on: Quietest setting, Loudest setting, Main filter life.
What we like
- 328 CFM smoke CADR
- App with scheduling
Watch out for
- 24.7 lb
Molekule PECOAir+
No scored spec where it is strictly ahead; its case rests on the strengths below.
What we like
- Widest sensor suite here
- H14-grade HEPA media
Watch out for
- No CADR
- Six-month filters
- Loudest low setting here (32 dB)
Verdict
PECOAir+ has more sensors (CO2 and TVOC). The 400S publishes a 328 CFM CADR and a one-year filter vs six months.
- Coway Airmega 400S: Coway: Airmega 400S
- Molekule PECOAir+: Molekule: PECOAir+