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Alen BreatheSmart 75i Large Room Air Purifier vs Coway Airmega 250

Alen BreatheSmart 75i Large Room Air Purifier leads 3 to 2 on the 5 rankable specs, but Coway Airmega 250 costs $350 less.

Catalog as of September 1, 2026

Why, in numbers

  • CADR: Alen BreatheSmart 75i Large Room Air Purifier lists 350 CFM across Smoke, Dust, Pollen (Alen sheet, 2026-09-02); Coway Airmega 250 lists 249 CFM (Smoke), 261 CFM (Dust), 230 CFM (Pollen) (Coway sheet, 2026-09-02).
  • Coverage area: Alen BreatheSmart 75i Large Room Air Purifier lists 1,400 sq ft (2 air changes/hr) / 700 sq ft (4 air changes/hr) (Alen sheet, 2026-09-02); Coway Airmega 250 lists 930 sq ft (2 air changes/hr) / 465 sq ft (4 air changes/hr) (Coway sheet, 2026-09-02).
  • Room size: Alen BreatheSmart 75i Large Room Air Purifier lists Large master suites, open living rooms, offices (Alen sheet, 2026-09-02); Coway Airmega 250 lists Large bedrooms, apartments, living rooms, and open layouts up to 930 sq ft (Coway sheet, 2026-09-02).
  • Filter types: Alen BreatheSmart 75i Large Room Air Purifier lists Medical-grade H13 True HEPA + Antimicrobial layer + Heavy Odor Carbon (Alen sheet, 2026-09-02); Coway Airmega 250 lists EZ-clean Washable Pre-filter + Max2 Green True HEPA and Activated Carbon filter (Coway sheet, 2026-09-02).
  • Filter life: Alen BreatheSmart 75i Large Room Air Purifier lists 12–15 months extra long filter life (Alen sheet, 2026-09-02); Coway Airmega 250 lists 12 months (Max2 filter) / Washable slide-out pre-filter (Coway sheet, 2026-09-02).

Manufacturer list price, not a live offer. Confirm current pricing before you buy.

Alen BreatheSmart 75i Large Room Air Purifier
$7493 spec wins
Swap

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Levoit Core 300S Smart True HEPA Air Purifier$149Winix 5500-2 Air Purifier$159Levoit Core 400S$219Coway Airmega AP-1512HH Mighty$229Blueair Blue Pure 311i Max$229Honeywell HPA300 HEPA Air Purifier$249Levoit Core 600S Smart True HEPA$299Blueair Blue Pure 211+ Auto$339Coway Airmega 400$549Blueair Protect 7470i$649Dyson Purifier Hot+Cool Formaldehyde HP09$799
Coway Airmega 250
$3992 spec wins
Swap

Compare a different air purifier

Levoit Core 300S Smart True HEPA Air Purifier$149Winix 5500-2 Air Purifier$159Levoit Core 400S$219Coway Airmega AP-1512HH Mighty$229Blueair Blue Pure 311i Max$229Honeywell HPA300 HEPA Air Purifier$249Levoit Core 600S Smart True HEPA$299Blueair Blue Pure 211+ Auto$339Coway Airmega 400$549Blueair Protect 7470i$649Dyson Purifier Hot+Cool Formaldehyde HP09$799

Buying for

Every rankable spec counts once. Pick a lens to score only what matters for your air purifier.

Straight answer

Overall: 3 to 2

Buy the Alen BreatheSmart 75i Large Room Air Purifier.

  • Leads 3 of 5 rankable overall specs; Coway Airmega 250 takes 2.
  • CADR: 350 CFM across Smoke, Dust, Pollen vs 249 CFM
  • Coverage area: 1,400 sq ft vs 930 sq ft
  • Coway Airmega 250 is $350 cheaper. Pay the difference only if cadr matters to you.

Check first: the Alen BreatheSmart 75i Large Room Air Purifier weighs over 25 lb (11 kg). Tick them under deal-breakers if that rules it out.

3 Alen BreatheSmart 75i Large Room Air Purifier5 rankable of 11 specsCoway Airmega 250 2

Deal-breakers

tick what would make you walk away

  • row

    Undersized for an open-plan living area.

    Clear:Alen BreatheSmart 75i Large Room Air Purifier · 1,400 sq ftTrips:Coway Airmega 250 · 930 sq ft
  • row

    Hard to move between rooms.

    Trips:Alen BreatheSmart 75i Large Room Air Purifier · 27.0 lbClear:Coway Airmega 250 · 20.5 lb

At a glance

The handful of numbers that decide most purchases in this category.

2 of 2 differ

CADR

Alen

350 CFM across Smoke, Dust, Pollen

Coway

249 CFM (Smoke), 261 CFM (Dust), 230 CFM (Pollen)

Coverage area

Alen

1,400 sq ft (2 air changes/hr) / 700 sq ft (4 air changes/hr)

Coway

930 sq ft (2 air changes/hr) / 465 sq ft (4 air changes/hr)

True 3-Year Cost of Ownership (TCO)

Upfront price + 3 years of consumables, fees & essential add-ons

Alen BreatheSmart 75i Large Room Air Purifier

Upfront list price$749
3-Yr B6-Pure heavy HEPA filter (Every 12–15 months (~$99/yr))+$297
3-Year Estimated Total$1,046

Coway Airmega 250

Upfront list price$399
3-Yr Max2 Green True HEPA filter (Every 12 months (~$55/yr))+$165
3-Year Estimated Total$564

Room Placement & Bedroom Noise Check

Physical clearance required for airflow, wall placement, and bedroom noise levels.

Ergonomic & Spatial Check

Wall Clearance Required

Cylindrical 360° filters cannot sit flush against walls without choking intake.

Alen

Requires 12 in perimeter airflow space

Coway

Bottom & dual-side intake: sits flush against back wall

Nighttime Sleep Mode Noise

Levels below 25 dB are virtually silent for light sleepers.

Alen

Standard sleep speed

Coway

22 dB sleep mode with auto-dimming LED light sensor

Unit Footprint & Dimensions

Alen

Standard room purifier footprint

Coway

Modern slim tower (19.7 × 18.5 × 8.3 in; 20.5 lb)

The 90-Day Owner Regret Check

Documented ergonomic quirks, hardware annoyances, and maintenance realities reported by real owners.

Post-Purchase Truths

Alen: What to watch for

  • Maintenance

    Requires periodic filter replacements to maintain airflow and odor capture.

    Activated carbon and HEPA media gradually saturate, needing replacement once or twice yearly depending on air pollution and pet shedding.

Coway: What to watch for

  • Maintenance

    Requires periodic filter replacements to maintain airflow and odor capture.

    Activated carbon and HEPA media gradually saturate, needing replacement once or twice yearly depending on air pollution and pet shedding.

Alen BreatheSmart 75i Large Room Air Purifier$7493 wins
Coway Airmega 250$3992 wins

Performance

leads 2-0
Performance specifications. Middle column is Alen BreatheSmart 75i Large Room Air Purifier, right column is Coway Airmega 250.
CADR350 CFM across Smoke, Dust, Pollen (wins this row: higher)249 CFM (Smoke), 261 CFM (Dust), 230 CFM (Pollen)
Room sizeLarge master suites, open living rooms, officesLarge bedrooms, apartments, living rooms, and open layouts up to 930 sq ft
Coverage area1,400 sq ft (2 air changes/hr) / 700 sq ft (4 air changes/hr) (wins this row: higher)930 sq ft (2 air changes/hr) / 465 sq ft (4 air changes/hr)

Filters

leads 1-0
Filters specifications. Middle column is Alen BreatheSmart 75i Large Room Air Purifier, right column is Coway Airmega 250.
Filter typesMedical-grade H13 True HEPA + Antimicrobial layer + Heavy Odor CarbonEZ-clean Washable Pre-filter + Max2 Green True HEPA and Activated Carbon filter
Filter life12–15 months extra long filter life (wins this row: higher)12 months (Max2 filter) / Washable slide-out pre-filter

Usability & Smart

leads 1-0
Usability & Smart specifications. Middle column is Alen BreatheSmart 75i Large Room Air Purifier, right column is Coway Airmega 250.
Noise levels25 dB (WhisperMax) – 49 dB (Turbo speed)22 dB (Sleep mode) – 54 dB (Max speed) (wins this row: lower)
Energy consumption45 W (Energy Star certified)60 W max power consumption (Energy Star Certified)
Smart featuresAlen Air App (Wi-Fi), auto modes, color ring statusSmart Auto Mode, Rapid Mode, Eco Mode, and Sleep Mode
Air quality sensorsLaser air quality sensor detecting fine particle levels with 5 color ringsReal-time particle sensor with colorful LED air quality indicator

Design & Ownership

leads 1-0
Design & Ownership specifications. Middle column is Alen BreatheSmart 75i Large Room Air Purifier, right column is Coway Airmega 250.
Weight27.0 lb (12.2 kg)20.5 lb (9.3 kg) (wins this row: lower)
WarrantyLifetime warranty (with active filter subscription)5 years limited warranty on motor / 1 year electronic parts
Most rows are from the official spec sheet. Marked rows are other published figures or our summary, not lab tests we ran.
Alen BreatheSmart 75i Large Room Air Purifier source (opens in a new tab)Coway Airmega 250 source (opens in a new tab)

Which one should you buy

Pick this one if

Alen BreatheSmart 75i Large Room Air Purifier

Commercial-grade quiet purifier cleaning up to 1,400 sq ft every 30 minutes with a lifetime warranty.

  • Industry-exclusive transferable Lifetime Warranty
  • Tuned pink noise frequencies promote deeper sleep on WhisperMax mode
  • Medical-grade H13 True HEPA filter lasts up to 15 months

What you give up

  • High initial investment
  • Tall tower profile
Full Alen BreatheSmart 75i Large Room Air Purifier specs →

Pick this one if

Coway Airmega 250

Modern slim aesthetic air purifier with Green True HEPA Max2 filtration, covering up to 930 sq ft, Smart Auto mode, and easy-clean washable pre-filter.

  • Green True HEPA filter captures 99.999% of 0.01-micron ultrafine particles and neutralizes odors
  • Easy-to-clean EZ-pull front pre-filter slides out from the top without opening the machine
  • Covers up to 930 sq ft with Smart Auto Mode and real-time PM2.5 particle sensor LED ring

What you give up

  • No Wi-Fi app connectivity on the standard 250 model (app available on 250S variant)
  • Substantial 20.5 lb weight
Full Coway Airmega 250 specs →

Best for each use

Bedrooms

Quiet nights: low-speed noise, sleep mode, schedules from your phone

For bedrooms, buy the Coway Airmega 250.

  • Leads 2 of 2 rankable bedrooms specs.
  • Noise levels: 22 dB vs 25 dB
  • Weight: 20.5 lb vs 27.0 lb
  • It is also $350 cheaper.

Big rooms & allergies

Open-plan rooms or allergies: CADR, coverage, filter grade

For big rooms & allergies, buy the Alen BreatheSmart 75i Large Room Air Purifier.

  • Leads 3 of 3 rankable big rooms & allergies specs.
  • CADR: 350 CFM across Smoke, Dust, Pollen vs 249 CFM
  • Coverage area: 1,400 sq ft vs 930 sq ft
  • Coway Airmega 250 is $350 cheaper. Pay the difference only if cadr matters to you.

Low running cost

Cheap to own: filter life, power draw, warranty

Too close to call on low running cost from the spec sheets. Only filter life is rankable here.

  • Energy consumption: 45 W vs 60 W max power consumption
  • Warranty: Lifetime warranty vs 5 years limited warranty on motor / 1 year…

Every answer above is scored from published figures. A lens uses only the rows that matter for that use, including marked rows that are not on the official sheet. Switch lenses interactively in the panel above.

Done deciding?

Open the full standalone spec sheet for either device.

Alen BreatheSmart 75i Large Room Air Purifier spec sheetCoway Airmega 250 spec sheet

Manufacturer pages: Alen BreatheSmart 75i Large Room Air Purifier ↗ · Coway Airmega 250 ↗

Common questions

Which is cheaper, the Alen BreatheSmart 75i Large Room Air Purifier or the Coway Airmega 250?

Coway Airmega 250 costs $350 less at list price.

What is the biggest catch with the Alen BreatheSmart 75i Large Room Air Purifier or Coway Airmega 250?

Coway Airmega 250 has this deal-breaker: under 1,000 sq ft coverage. Undersized for an open-plan living area.

Which is better for bedrooms, the Alen BreatheSmart 75i Large Room Air Purifier or the Coway Airmega 250?

For bedrooms, buy the Coway Airmega 250. Leads 2 of 2 rankable bedrooms specs. Noise levels: 22 dB vs 25 dB

What cannot be compared from spec sheets?

Of the 11 specs tracked here, 6 are descriptive and cannot be ranked on numbers alone. Spec sheets also cannot measure subjective factors like build quality, real-world performance, or comfort.

Other matchups

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