The Dyson Purifier Cool TP07 and the Coway Airmega 400 attract very different buyers, which is exactly why people compare them. This is a research-based comparison built from verified specs, not a hands-on test, to help you decide between Dyson's design-led two-in-one and Coway's clean-air-per-dollar powerhouse. The short version: the Dyson is a beautiful fan-purifier with an app, while the Coway delivers far more measurable clean air for less money.
Quick answer
| Attribute | Dyson Purifier Cool TP07 | Coway Airmega 400 |
|---|---|---|
| CADR | No AHAM CADR (Dyson's own metric) | 328 / 328 / 400 |
| Coverage | Whole-room (marketed ~800 sq ft) | 1,560 sq ft @ 2 ACH (~780 @ 4.8) |
| Filtration | Sealed True HEPA (H13) + carbon | Dual True HEPA + carbon |
| Filter cost/yr | ~$80 | ~$80 |
| Noise | 35–56 dBA | 22–52 dBA |
| Smart features | Auto + sensor + app | Auto + sensor, no app |
| Price | ~$450–550 | ~$400–450 |
| Best for | Design, cooling fan, app control | Maximum clean air per dollar |
Where Dyson wins
The Dyson Purifier Cool TP07 wins on versatility and design. It's the only machine here that doubles as a bladeless tower fan, so it cools you in summer while filtering the air all year — a genuine two-in-one that saves you buying a separate fan. Its sealed True HEPA (H13) and carbon system is well engineered to keep filtered air from leaking around the filter, and it comes with a full app, air-quality sensor, and auto mode for hands-free, connected operation.
It's also the style pick, plain and simple. The tall, bladeless tower looks unlike any conventional purifier and reports detailed air-quality data to your phone, which appeals to buyers who want an appliance that looks and feels premium in a modern room. The catch is that Dyson doesn't publish an AHAM CADR — it uses its own whole-room metric — so you can't line its cleaning speed up against CADR-rated rivals, and in practice it tends to move less filtered air than a dedicated machine at this price. You're paying for design and the fan function as much as the filtration.
Where Coway wins
The Coway Airmega 400 wins where it counts most for an air purifier: clean air per dollar. It publishes a strong CADR up to about 400 CFM with a dual True HEPA and carbon filtration system, and it covers a very large room fast — roughly 780 sq ft at a meaningful 4.8 air changes per hour. At around $400 to $450 it undercuts the Dyson while delivering far more measurable cleaning power, so if your goal is simply cleaner air over a big space, this is the machine.
It's also quieter and more refined in operation, running as low as 22 dBA and topping out around 52, with a sensor-driven auto mode that ramps only when needed. Filter costs are similar to the Dyson's at about $80 a year, but because the Coway cleans more air for a lower purchase price, it's the cheaper machine to own over time. What you give up is the app and the fan function — there's no phone control and it won't blow cooling air at you. For buyers who want performance over flair, that's an easy trade.
How to choose
Ask what you're really buying. If you want a statement piece that cools you in summer, controls from your phone, and looks like nothing else in the room, the Dyson Purifier Cool TP07 delivers that experience — just know you're paying a premium for design and the fan, not for class-leading clean-air numbers. If you want the most cleaning power for your money in a large space, the Coway Airmega 400 is the clear value winner, quieter and stronger for less.
If the CADR question is tripping you up, our guide on what CADR and CFM actually mean explains why Dyson's missing figure matters. And to match either machine to your specific room and priorities, run your details through the air-purifier finder.
Frequently asked questions
Why doesn't the Dyson TP07 have a CADR?
Dyson doesn't publish an AHAM-verified CADR; it rates the Purifier Cool TP07 with its own whole-room testing metric instead of the industry-standard clean-air delivery rate. That makes it hard to compare directly against the Coway Airmega 400, which publishes CADR figures around 328 to 400 CFM. The Dyson still filters the air with a sealed True HEPA and carbon system — you just can't line its cleaning speed up against CADR-rated machines on paper.
Does the Dyson work as both a fan and an air purifier?
Yes — that's its signature feature. The Dyson Purifier Cool TP07 is a bladeless tower fan and an air purifier in one, so it cools you in summer while filtering the air year-round. The Coway Airmega 400 is a dedicated purifier only; it doesn't blow air at you as a fan. If you want a two-in-one appliance and a striking design, the Dyson delivers that; if you just want maximum clean air, the Coway focuses on that alone.
Which gives more clean air per dollar, Dyson or Coway?
The Coway Airmega 400, clearly. It delivers a high published CADR up to about 400 CFM and covers a very large room, at a price of roughly $400 to $450. The Dyson TP07 costs around $450 to $550 without a published CADR and generally moves less filtered air. If your goal is the most clean air for your money, the Coway wins decisively; the Dyson's price reflects its design and fan function, not raw cleaning value.
Is the Dyson TP07 quiet enough for a bedroom?
It's reasonably quiet, running roughly 35 to 56 dBA, and it has a night mode. But the Coway Airmega 400 is quieter still, from about 22 to 52 dBA, and moves far more air while doing it. Both are fine for a bedroom; the Coway is the better choice if quiet plus power matters, while the Dyson's appeal in a bedroom is doubling as a cooling fan.
Are Dyson filters more expensive than Coway's?
They're similar — both run around $80 a year. The bigger cost difference is upfront: the Dyson TP07 costs more to buy while delivering less measurable clean air, whereas the Coway Airmega 400 costs less and cleans a larger room faster. Over several years, the Coway is the cheaper machine to own for the air-cleaning performance you get.
