Alen BreatheSmart 75i vs Coway Airmega 400
Bottom line
In our scoring the Alen BreatheSmart 75i wins, 6.3 to 4.0, a 2.3-point gap, and both still land in our Limited band. The Coway's hard-fail for claiming 1,560 sq ft against an honest ceiling near 508 sq ft is what drags it down in our view, even though it is the cheaper unit up front at $649 versus $799 and uses pure mechanical filtration with no ionizer or ozone. The Alen's defeatable ionizer is a real mark against it in our rubric, but its rated room of 448 sq ft is one its AHAM CADR can honestly deliver, and its filters run about $99 a year versus the Coway's $129, which we view as the better fit-and-cost package.
The biggest split here is honesty about coverage. The Coway Airmega 400 is rated for 1,560 sq ft, but its AHAM-verified CADR only honestly supports about 508 sq ft, so we apply a room-size-overstatement hard-fail. The Alen BreatheSmart 75i is rated for 448 sq ft, which sits inside its honest ceiling of 543 sq ft, though it ships with a defeatable ionizer. Both land at the same five-year cost of about $1,294, and both have AHAM-verified CADR.
| 351 cfm (AHAM-verified) | CADR (independently verified?) | 400 cfm (AHAM-verified) |
| 7.0 | Verified Performance30% | 3.0 |
| 6.0 | Total Cost of Ownership25% | 1.0 |
| 5.0 | Certification15% | 3.0 |
| 5.0 | Safety15% | 8.0 |
| 8.0 | Practical Fit15% | 8.0 |
FAQ
- Is the Alen BreatheSmart 75i better than the Coway Airmega 400?
- In our scoring the Alen BreatheSmart 75i rates 6.3/10 and the Coway Airmega 400 4.0/10. In our scoring the Alen BreatheSmart 75i wins, 6.3 to 4.0, a 2.3-point gap, and both still land in our Limited band. The Coway's hard-fail for claiming 1,560 sq ft against an honest ceiling near 508 sq ft is what drags it down in our view, even though it is the cheaper unit up front at $649 versus $799 and uses pure mechanical filtration with no ionizer or ozone. The Alen's defeatable ionizer is a real mark against it in our rubric, but its rated room of 448 sq ft is one its AHAM CADR can honestly deliver, and its filters run about $99 a year versus the Coway's $129, which we view as the better fit-and-cost package.
- Does the Coway Airmega 400 really cover 1,560 sq ft?
- Not by our math. Its AHAM-verified CADR honestly supports about 508 sq ft, so the 1,560 sq ft claim is the reason we apply a room-size hard-fail. In our view, treat it as a unit for a room around 500 sq ft, not 1,560.
- Is the Alen BreatheSmart 75i worth the extra money over the Coway?
- In our scoring, yes. The Alen costs more up front ($799 vs $649) but scores 6.3 to the Coway's 4.0, runs cheaper on filters ($99 vs $129 a year), and matches it at about $1,294 over five years. Its rated 448 sq ft is coverage its CADR can honestly deliver.
- Which one avoids ozone and ionizers?
- The Coway Airmega 400 does. The facts list its ozone technology as none, so it is pure mechanical filtration. The Alen BreatheSmart 75i carries an ionizer, though it is defeatable, meaning you can switch it off.