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COWAY Air Purifiers for Large Room Whole Home Up to ...

By Coway · Air Purifiers · Home & Workspace · More from Coway

  • Coverage: 2512 sq ft at 1 air change per hour
  • CADR: 285 smoke / 306 dust / 339 pollen
  • Max2 filter combines activated carbon + HEPA
  • Noise level: 22 to 52 dB(A)
  • Dimensions: 13.6 x 21.2 x 13.6 in

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Summary

A large-room air purifier that Coway rates for 2,512 sq ft at one air change per hour, with a washable pre-filter and a combined carbon and HEPA filter. Check the coverage math before you buy: at two air changes per hour the realistic figure is about 1,256 sq ft, and the Max2 filter set costs about $99 a year.

Strengths

  • A 5-year warranty, longer than most units in this class.
  • Strong particle filtration, with a 285 cfm smoke CADR and a 339 cfm pollen CADR.
  • Real-time PM2.5 sensing drives the auto, sleep and eco modes.
  • Owners report units running 24/7 for more than 5 years without failure.
  • Quiet at low speeds at 22 dB.
  • Covers a large open room for less than hard-competition units of the same size.

Weaknesses

  • The Max2 filter set costs about $99 a year, the most common owner complaint.
  • The carbon and HEPA layers are replaced as one set, even when only one is spent.
  • Gas and VOC removal is weak next to dedicated carbon purifiers.
  • No casters, so the 21.4 lb unit is awkward to move between rooms.
  • The base 300 has no Wi-Fi, app or scheduling; that is the 300S.

Verified specifications

ModelAirmega 300, AP-1515H, the non-Wi-Fi version of the line.
Coverage2,512 sq ft at 1 air change per hour; about 1,256 sq ft at 2 air changes per hour.
CADR285 smoke / 306 dust / 339 pollen cfm.
Filtrationthree stages — a washable pre-filter plus a Max2 activated-carbon and Green True HEPA filter set.
Filter lifeabout 12 months, or 6-12 months depending on use.
Noise22-52 dB(A).
Fan speedsthree manual speeds plus auto, sleep and eco modes.
Air qualityreal-time PM2.5 sensor with a 4-color LED indicator.
Timer1, 4 and 8 hours.
CertificationsEnergy Star, Intertek, California Air Resources Board.
Warranty5 years.
Dimensions13.6 × 21.2 × 13.6 in; 21.4 lbs.
Power57 W.
Full research notes and sources

Coverage and sizing

Coway rates the Airmega 300 for 2,512 sq ft, but that is one air change per hour. Consumer Reports frames the same unit at up to 1,256 sq ft, which is the 2-air-change figure, and that is the number to size a whole-home purchase on. Owners in r/AirPurifiers warn that the large-space rating depends on layout and airflow, and that the unit is inadequate for very large spaces.

Filters and running costs

The Max2 filter set is a combined carbon and HEPA unit, so when either layer is spent the whole set is replaced. Coway lists the set at $99, and Consumer Reports estimates the same $99 a year, making it the dominant ownership cost. Coway gauges filter life by usage rather than a fixed clock and states 6-12 months. Electricity runs about $17 a year on Consumer Reports’ estimate. The washable pre-filter is cleaned rather than replaced.

Independent test results

Instrumented testing of this exact model is thin. HouseFresh cleared its test room of incense smoke in 26 minutes and measured a CADR of 298.7 CFM. AirGlen’s lab measured 320 CFM and 78 W. Consumer Reports includes the unit in its lab program and ranks it #4 of 35 tested room air purifiers, but the full scores are paywalled. Wirecutter’s own picks are the Mighty models, not the 300.

Which model this is

This page covers the Airmega 300, model AP-1515H, the non-Wi-Fi version. The Airmega 300S (AP-1515G) shares the chassis and filter set and adds Wi-Fi, app and voice control. Don’t confuse it with the smaller Airmega 250 or 200M or the larger Airmega 400. The Amazon listing for this model is ASIN B0BZTQ16B5.

Is it worth it?

Coway’s US store lists the Airmega 300 at $549, and Consumer Reports lists it from $449.99. A $362.25 sale on Coway’s own homepage was marked sold out at the time of check. At around $450-500 the unit is competitive for a large room with a 5-year warranty and proven particle filtration; at $549 direct you are paying a premium over the street price. Above $600 the value weakens, because the larger Airmega 400 offers more coverage and has been independently tested. Budget roughly $116 a year for filters and electricity.

Sources

Manufacturer:

Independent reviews:

Owner reports:

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