Coway Airmega 100

Coway Airmega 100

By Coway · Air Purifiers · Home & Workspace

  • 3-stage filtration: mesh pre-filter, True HEPA, deodorization/carbon filter
  • Covers up to 810 sq ft
  • Real-time AQI air-quality monitor with color indicator
  • Auto mode, timer, filter-change indicator, night light

Lowest price seen
$75.95
from $75.95 at eBay · Checked Oct 12, 2026

Prices are snapshots. Check the current price with the store.

Problems, parts and running costs

Summary

A compact 8.7-inch-square HEPA purifier with a PM2.5 sensor and auto mode, aimed at bedrooms and small offices. Its real capability is roughly a 160-220 sq ft machine at five air changes per hour, not the headline 810 sq ft, and it has no app, Wi-Fi or remote.

Strengths

  • Honest small-room CADR: 124 cfm dust, 112 cfm pollen and 108 cfm smoke are appropriate for roughly 160-220 sq ft.
  • A three-stage 3-in-1 cartridge with a vacuumable pre-filter and HEPA media at a low price.
  • PM2.5 sensor with auto mode, which two reviewers single out as reacting quickly to air-quality changes.
  • Quiet at low and sleep settings, near the claimed 20 dB, with a small 8.7-inch footprint that fits under a desk.
  • Low running cost at about $24 a year electricity plus $40 a year filter on Consumer Reports’ figures.
  • Filter-life indicator, timer and a panel lock for children and pets.

Weaknesses

  • The 810 sq ft headline is a one-air-change-per-hour figure; at the CDC/EPA-recommended 5 ACH the usable ceiling is far smaller.
  • No app, Wi-Fi, voice control or remote, so air quality cannot be checked or the fan changed from a phone.
  • No VOC sensor, and the thin carbon stage does not handle strong cooking odors or heavy smoke.
  • Full speed was measured at 57.2 dBA, well above Coway’s 48 dB(A) ceiling, and speed 1 cleans much more slowly.
  • Filter sourcing from Coway’s own US store has been inconsistent, and there is no published service-parts catalog.
  • Warranty is 1 year, with no manufacturer warranty document located for this specific model.

Verified specifications

Room coverageup to 810 sq ft at 1 air change per hour; 405 sq ft at 2 ACH.
Practical ceilingan owner calculation puts it at 162 sq ft at 5 ACH, NBC at 167 sq ft at 4.8 ACH, and HouseFresh at about 222 sq ft at 5 ACH.
CADR108 cfm smoke, 124 cfm dust, 112 cfm pollen, per manufacturer and NBC figures.
Filtrationintegrated 3-in-1 cartridge, a vacuumable pre-filter plus HEPA media plus a deodorization/carbon layer; the layers are not separable.
Particle claim99.999% of particles down to 0.01 microns, footnoted to Korea Conformity Laboratories chamber testing; a brand-level claim, not an Airmega-100-specific test.
SensorPM2.5 particle sensor with a color-changing AQI ring and automatic fan control; no VOC sensor and no numeric readout.
Fan speeds3, plus auto mode.
Timerpreset auto-off at 1, 2, 4 or 8 hours.
Filter lifeup to 12 months; replacement SKU co16195 at $39.99.
NoiseCoway claims 20-48 dB(A) with a 20 dB sleep mode; HouseFresh measured 35.6 dBA sleep, 38.9 speed 1, 46.5 speed 2 and 57.2 speed 3 at three feet.
Power25 W rated; HouseFresh measured 23.2 W at maximum, 9.5 W at speed 2, 5.6 W at speed 1, 3.5 W in sleep and 0.3 W standby.
Dimensions and weight8.7 × 8.7 × 15.6 in and about 6.6-7 lb.
Controlssix-button touch panel, panel lock for children and pets, three light settings (AQI indicator, night light, off).
Connectivityno Wi-Fi, no app, no voice control and no remote.
CertificationscETL, Energy Star and CARB.
Warranty1 year per Consumer Reports; Coway’s own warranty table lists 1 year on internal/functional parts and 2 years on motor/electronic parts.
Full research notes and sources

Coverage: the number that matters

The headline coverage number is a one-air-change-per-hour figure. Coway’s own blog says the unit covers rooms up to 810 sq ft while circulating purified air once per hour, and the Canadian spec table states the same 1 ACH / 810 sq ft. A reviewer who has owned the unit since November 2024 calculates that at the CDC and EPA-recommended 5 air changes per hour the realistic ceiling is about 162 sq ft, roughly a 10-by-16-ft room. At 200 sq ft it still delivers about 4 ACH, which he calls much better than nothing but short of the standard, and he recommends the larger AP-1512HH Mighty for anything bigger. HouseFresh’s independent testing supports about 222 sq ft at 5 ACH, and NBC translates it to about 167 sq ft at 4.8 ACH. The practical conclusion is to buy by CADR, not by coverage: this is a small-room machine.

Filtration, noise and power

Filtration is a single inseparable 3-in-1 cartridge: a pre-filter that must be vacuumed and never washed, HEPA media, and a deodorization layer. Coway states a 99.999% removal claim for particles down to 0.01 microns, but its own technology page does not list the Airmega 100 among the model codes its footnotes were tested on, so treat that as a brand-level claim. TechRadar’s reviewer found the three-stage filter does a top job on dust, pollen and pet dander but that the carbon stage cannot tackle strong cooking smells. Noise is where the marketing and measurement diverge: Coway publishes 20-48 dB(A), while HouseFresh measured 35.6 dBA in sleep and 57.2 dBA at full speed from three feet. The unit can be bedroom-quiet when turned down, but it cannot deliver maximum CADR and stay whisper quiet at the same time. Power draw is modest at 25 W rated and 23.2 W measured at maximum.

Running cost and repairability

Consumer Reports budgets $24 a year for electricity and $40 a year for filters, about $64 a year all-in, against a replacement filter sold at $39.99. Maintenance is minimal: vacuum the pre-filter, replace the cartridge at roughly 12 months, and keep the sensor and intakes clear. Repairability is not a meaningful category here, because this is a sealed plastic appliance with no published service-parts catalog and no replacement motor, board or sensor pricing. Coway instructs buyers to use genuine Coway filters only.

Price and value

Coway lists the Airmega 100 at $129.99, with a filter bundle at $152.99 against a $169.98 compare-at. Consumer Reports’ shopping module shows from $79.99 across three retailers, TechRadar recorded $119.99 in June 2026, and NBC observed $83.99 against $129.99 regular. The value bands are clear: at or below $100 it is strong, because few no-app HEPA units at that price combine a PM2.5 sensor, auto mode and a filter-life indicator; $101-$130 is fair-to-good for a bedroom or home office under about 200 sq ft; $131-$160 is weak, because the larger Airmega 250 or the AP-1512HH Mighty become the right comparison; and above $160 nothing found supports the spend. The right comparison throughout is CADR per dollar, not the coverage number.

Which model this is

This page covers the Coway Airmega 100 only. The “100” is a room-size marketing tier, not a model number, and the spec tables carry no separate alphanumeric code for the US unit. Don’t merge it with the Airmega 50, 150, 250, 350, 400S, AP-1512HH Mighty, Airmega Storm, Airmega 600 or the app-equipped Airmega IconS, which have different CADR, features and prices.

Sources

Manufacturer:

Independent reviews:

Retailer:

Owner reports:

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