Alen BreatheSmart 45i vs Coway AP-1512HH Mighty
Quick take: The Coway AP-1512HH Mighty costs $260 less; the Coway AP-1512HH Mighty moves more air (233 CADR, 20% more cleaning power); the Coway AP-1512HH Mighty costs about $35 less per year in filters — over five years that often outweighs the sticker gap.
| Spec | Alen BreatheSmart 45i | Coway AP-1512HH Mighty |
|---|---|---|
| Price | ~$430 | ~$170 |
| Rating | 4.8★ (703) | — |
| Type | Medium Room | Large Room |
| CADR (smoke) | 194 CFM | 233 CFM |
| Honest Coverage (AHAM) | ~301 sq ft | ~361 sq ft |
| Claimed Coverage | 800 sq ft | 874 sq ft |
| Noise (sleep) | 23 dB | 24 dB |
| Noise (max) | 49 dB | 54 dB |
| Filter Cost / Year | $85 | $50 |
| Filter | Pre-filter + B4 True HEPA (H13); Pure/Fresh/Odor/VOC filter variants | True HEPA + activated carbon |
| Filter Life | 12 mo | 12 mo |
| Max Power | 50W · Energy Star | 77W · Energy Star |
| Auto Mode | Sensor + auto | Sensor + auto |
| Ionizer | Yes | Yes |
| WiFi Control | Built-in | None |
| Weight | 15 lbs | 12.3 lbs |
| Maintenance | Filter cost depends heavily on which B4 variant you choose: the basic Pure runs about $70/yr, the carbon Fresh ~$85, and the heavy-carbon VOC/Smoke version $120 - Alen's 9-12 month life claim is fair, but the upsell ladder adds up fast. Critically, the 'Forever' lifetime warranty is conditional: you must keep an active filter subscription or be able to prove you've only ever used genuine Alen filters, so third-party filters void it. The ionizer is switchable from the panel if you'd rather run pure HEPA. | The front panel pops off without tools; vacuum the washable pre-filter every 2-4 weeks. The carbon filter is replaced every 6 months and the True HEPA annually, and OEM filters are cheap and everywhere — a full year of genuine filters runs about $50, with quality third-party options under $35. Wipe the particle sensor lens (right side, behind a small door) every couple of months or auto mode gets lazy. No app, no subscription, no DRM chips on filters. |
| Warranty | Lifetime - conditional on filter subscription or proof of OEM-only filter use | 3 years |
Pros & cons
Alen BreatheSmart 45i
- ✓Best-in-class acoustics - 23 dB floor and a pleasant sound signature at every speed
- ✓Lifetime warranty (conditional) backed by responsive US-based support
- ✓Switchable ionizer that measures under 0.001 ppm ozone - off means off
- ✓Quality laser particle sensor with a well-behaved auto mode and app
- ✓Interchangeable designer panels that pass as furniture
- ✓Energy Star certified, sipping under 50 W at maximum
- ✓Filter variants let you buy carbon capacity only when you need it
- ✗Claimed 800 sq ft is 2.7x its honest 301 sq ft AHAM coverage
- ✗Poor airflow-per-dollar - $150 units out-clean it in independent tests
- ✗Warranty voids without a filter subscription or exclusive OEM filter use
- ✗Filter costs climb to $120/yr for the carbon-heavy VOC variant
- ✗$430 price is flagship money for medium-room performance
Coway AP-1512HH Mighty
- ✓AHAM-verified performance that matches purifiers costing twice as much
- ✓Very quiet 24 dB lowest speed — fine for light sleepers
- ✓Cheap filters (~$50/yr OEM, less third-party) available everywhere
- ✓Eco mode stops the fan when air is clean, cutting power use to near zero
- ✓3-year warranty beats Winix and Levoit
- ✓Ionizer is fully switchable and off by default
- ✓Light (12.3 lbs) with a simple pop-off front panel
- ✓Constant sale pricing — routinely dips to $140-150
- ✗Dust sensor is dated and reacts slower than newer rivals
- ✗No Wi-Fi or app on this model
- ✗Air-quality ring is bright at night and lamp-off is manual
- ✗54 dB on high is noticeable in a bedroom
- ✗874 sq ft marketing claim is a 1-ACH number — real coverage is 361 sq ft
- ✗Design is functional but plasticky next to a Blueair