Head to head

Alen BreatheSmart 75i Large Room Air Purifier vs Coway Airmega AP-1512HH Mighty

Alen BreatheSmart 75i Large Room Air Purifier leads 3 to 2 on the 5 rankable specs, but Coway Airmega AP-1512HH Mighty costs $520 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 AP-1512HH Mighty lists 233 CFM (Smoke), 246 CFM (Dust), 240 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 AP-1512HH Mighty lists 361 sq ft (4.8 air changes/hr) / 874 sq ft (2 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 AP-1512HH Mighty lists Bedrooms, home offices, medium living rooms (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 AP-1512HH Mighty lists 4-Stage: Washable Pre-filter + Deodorization Carbon + True HEPA + Vital Ion (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 AP-1512HH Mighty lists 12 months (True HEPA) / 6 months (Carbon) (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

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Coway Airmega AP-1512HH Mighty

$2292 spec wins

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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 AP-1512HH Mighty takes 2.
CADR: 350 CFM across Smoke, Dust, Pollen vs 233 CFM
Coverage area: 1,400 sq ft vs 361 sq ft
Coway Airmega AP-1512HH Mighty is $520 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 AP-1512HH Mighty 2

Deal-breakers

tick what would make you walk away

No Wi-Fi approw
No schedules or remote control from your phone.
Clear:Alen BreatheSmart 75i Large Room Air Purifier · Alen Air AppTrips:Coway Airmega AP-1512HH Mighty · Smart Auto Mode + Eco Mode
Under 1,000 sq ft coveragerow
Undersized for an open-plan living area.
Clear:Alen BreatheSmart 75i Large Room Air Purifier · 1,400 sq ftTrips:Coway Airmega AP-1512HH Mighty · 361 sq ft
Over 25 lb (11 kg)row
Hard to move between rooms.
Trips:Alen BreatheSmart 75i Large Room Air Purifier · 27.0 lbClear:Coway Airmega AP-1512HH Mighty · 12.3 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

233 CFM (Smoke), 246 CFM (Dust), 240 CFM (Pollen)

Coverage area

Alen

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

Coway

361 sq ft (4.8 air changes/hr) / 874 sq ft (2 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 AP-1512HH Mighty

Upfront list price$229

3-Yr HEPA + 2x carbon pack (Annual filter pack (~$30/yr))+$90

3-Year Estimated Total$319

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

Front-intake design: can sit almost flush against walls (leaves floor space open)

Nighttime Sleep Mode Noise

Levels below 25 dB are virtually silent for light sleepers.

Alen

Standard sleep speed

Coway

24.4 dB lowest speed (vital ionizer can be toggled off)

Unit Footprint & Dimensions

Alen

Standard room purifier footprint

Coway

Boxy square unit (16.8 × 18.3 × 9.6 in; 12.3 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

Hardware Quirk
Ionizer ("Vital Ion") produces negligible ozone and should be disabled.
Many asthma and allergy sufferers immediately toggle the optional ionizer off to ensure completely emission-free mechanical HEPA filtration.

Alen BreatheSmart 75i Large Room Air Purifier$7493 wins

Coway Airmega AP-1512HH Mighty$2292 wins

Performance Filters Usability & Smart Design & Ownership

11 of 11 attributes differ. Identical rows are dimmed.

Performance

leads 2-0

Performance specifications. Middle column is Alen BreatheSmart 75i Large Room Air Purifier, right column is Coway Airmega AP-1512HH Mighty.
CADR	350 CFM across Smoke, Dust, Pollen (wins this row: higher)	233 CFM (Smoke), 246 CFM (Dust), 240 CFM (Pollen)
Room size	Large master suites, open living rooms, offices	Bedrooms, home offices, medium living rooms
Coverage area	1,400 sq ft (2 air changes/hr) / 700 sq ft (4 air changes/hr) (wins this row: higher)	361 sq ft (4.8 air changes/hr) / 874 sq ft (2 air changes/hr)

Filters

leads 1-0

Filters specifications. Middle column is Alen BreatheSmart 75i Large Room Air Purifier, right column is Coway Airmega AP-1512HH Mighty.
Filter types	Medical-grade H13 True HEPA + Antimicrobial layer + Heavy Odor Carbon	4-Stage: Washable Pre-filter + Deodorization Carbon + True HEPA + Vital Ion
Filter life	12–15 months extra long filter life (wins this row: higher)	12 months (True HEPA) / 6 months (Carbon)

Usability & Smart

leads 1-0

Usability & Smart specifications. Middle column is Alen BreatheSmart 75i Large Room Air Purifier, right column is Coway Airmega AP-1512HH Mighty.
Noise levels	25 dB (WhisperMax) – 49 dB (Turbo speed)	24 dB (Low) – 53 dB (Turbo high) (wins this row: lower)
Energy consumption	45 W (Energy Star certified)	77 W max (Energy Star verified, 4.9W in Eco mode)
Smart features	Alen Air App (Wi-Fi), auto modes, color ring status	Smart Auto Mode + Eco Mode (no Wi-Fi app)
Air quality sensors	Laser air quality sensor detecting fine particle levels with 5 color rings	Air quality particle sensor with 3-color real-time LED indicator

Design & Ownership

leads 1-0

Design & Ownership specifications. Middle column is Alen BreatheSmart 75i Large Room Air Purifier, right column is Coway Airmega AP-1512HH Mighty.
Weight	27.0 lb (12.2 kg)	12.3 lb (5.6 kg) (wins this row: lower)
Warranty	Lifetime warranty (with active filter subscription)	3 years limited manufacturer warranty

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 Coway Airmega AP-1512HH Mighty source

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 AP-1512HH Mighty

Award-winning compact 4-stage True HEPA air purifier with Vital Ionizer and energy-saving Eco mode.

High smoke and particulate filtration efficiency in a compact footprint
Eco Mode powers off fan automatically after 30 minutes of clean air
Washable pre-filter extends the life of internal carbon and HEPA filters

What you give up

No Wi-Fi connectivity or mobile smartphone app
Ionizer feature produces trace ozone if left enabled

Full Coway Airmega AP-1512HH Mighty specs →

Best for each use

Bedrooms

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

For bedrooms, buy the Coway Airmega AP-1512HH Mighty.

Leads 2 of 2 rankable bedrooms specs.
Noise levels: 24 dB vs 25 dB
Weight: 12.3 lb vs 27.0 lb
It is also $520 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 233 CFM
Coverage area: 1,400 sq ft vs 361 sq ft
Coway Airmega AP-1512HH Mighty is $520 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 77 W max
Warranty: Lifetime warranty vs 3 years limited manufacturer warranty

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 sheet Coway Airmega AP-1512HH Mighty spec sheet

Manufacturer pages: Alen BreatheSmart 75i Large Room Air Purifier ↗ · Coway Airmega AP-1512HH Mighty ↗

Common questions

Which is cheaper, the Alen BreatheSmart 75i Large Room Air Purifier or the Coway Airmega AP-1512HH Mighty?

Coway Airmega AP-1512HH Mighty costs $520 less at list price.

What is the biggest catch with the Alen BreatheSmart 75i Large Room Air Purifier or Coway Airmega AP-1512HH Mighty?

Coway Airmega AP-1512HH Mighty has this deal-breaker: no Wi-Fi app. No schedules or remote control from your phone.

Which is better for bedrooms, the Alen BreatheSmart 75i Large Room Air Purifier or the Coway Airmega AP-1512HH Mighty?

For bedrooms, buy the Coway Airmega AP-1512HH Mighty. Leads 2 of 2 rankable bedrooms specs. Noise levels: 24 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.

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