Dyson Purifier Cool Formaldehyde TP09.

The Gavler Review.

Dyson Purifier Cool Formaldehyde TP09 Review: The $700 Question

The Dyson Purifier Cool Formaldehyde TP09 ranks number 10 on Gavler's Best Tower Fans list with a 7.6, and it's the most expensive product on that list by a wide margin. At $700, it's a bladeless tower fan wrapped around a genuine air-treatment system, headlined by a catalytic filter that continuously breaks down formaldehyde — a VOC common in the particle-board cabinetry, engineered-wood flooring, and adhesives used in newer construction. TechRadar came away impressed, writing that "overall, this sleek looking purifier is well worth the investment." TechHive, testing the same machine, landed on a very different bottom line: "this purifier can't match the power of other units in its price range." Both are right, and reconciling them is the whole story of who should actually buy this thing.

Review by The Gavler Team, built on Gavler's standard testing and sourcing process for the Best Tower Fans list.

What it is

The TP09 is the flagship of Dyson's bladeless tower fan and purifier lineup, sitting one tier above the Dyson Purifier Cool TP07 and roughly $200 more expensive. It starts from the same foundation as the TP07 — a sealed HEPA H13 filter for fine particulates, an activated-carbon layer for general VOCs and odors, Dyson's bladeless Air Multiplier cooling, and 350 degrees of oscillation across ten fan speeds. On top of that, the TP09 adds a solid-state formaldehyde sensor and a separate catalytic filter that never needs replacing, because it doesn't trap formaldehyde so much as chemically convert it into carbon dioxide and water on contact. Dyson also layers on nitrogen dioxide and general VOC sensors, an LCD display showing live air-quality data, a night mode, and the same Dyson Link app and Alexa/Siri/Google Assistant voice control the TP07 offers. TechHive's review noted the unit tracks "not just levels of that chemical but also nitrogen dioxide, other VOCs, and both PM2.5 and PM10 levels" — this is a purifier built around comprehensive sensing, not just filtration.

In use

The formaldehyde catalysis is the TP09's entire reason for existing over the TP07, and reviewers who tested it over weeks rather than days generally confirm it works as described. Homes & Gardens' Dan Fauzi ran the TP09 as his primary fan and purifier for over a month and reported that after leaving windows open too long, the unit "managed to get it back to a comfortable green in less than 40 minutes" on the air-quality display — a legitimate, measurable response to degraded air. TechRadar's testing echoed that responsiveness, finding the unit "reacted quickly to particles" including everyday sources like dry shampoo and perfume.

But both outlets that spent real time with the machine converge on the same complaint: it purifies better than it cools. Homes & Gardens put it plainly after a month of daily use: the TP09 "does a much better job at purifying than it does at cooling." Effective airflow only shows up at speed six or higher, and at those speeds the fan gets loud enough to be distracting during TV or sleep — TechHive's own testers found it "too noisy to have on at night even while in sleep mode." That's a real problem for a product marketed partly as a cooling fan: the two functions don't perform at the same level, and the one most buyers interact with daily — moving air on a hot afternoon — is the weaker of the two.

There's also a data-overload question. The MyDyson app tracks PM2.5, PM10, VOCs, NO2, formaldehyde, temperature, and humidity in granular, swipeable detail, and it's genuinely well built. But Homes & Gardens' reviewer, after weeks of using it, was candid that "much of this data isn't essential... if this is one of the reasons why the TP09 costs so much, I'd say it isn't worth it." That's a fair challenge to Dyson's pricing logic: a chunk of the $700 goes toward monitoring depth that's interesting to look at but doesn't change what most households actually do day to day.

Strengths

• Genuine, continuous formaldehyde destruction. The catalytic filter never needs replacing and produces measurable results, confirmed independently by testers who tracked air-quality readings before and after use.
• A dedicated formaldehyde sensor most competitors skip. This is the TP09's real point of differentiation — it's not just filtering formaldehyde, it's telling you in real time whether the filtration is working.
• Comprehensive, well-designed air-quality monitoring. PM2.5, PM10, VOC, and NO2 tracking on both the unit's LCD and the Dyson Link app, with a week of stored history.
• 350-degree oscillation and quiet build quality typical of Dyson's bladeless line, plus the safety upside of no exposed blades around kids or pets.

The trade-offs — who should skip it

• You're in an older home without a formaldehyde source. If there's no fresh particle board, engineered flooring, or new cabinetry off-gassing in your space, the catalytic filter is solving a problem you don't have — and you're paying $200 more than the TP07 for it.
• Cooling performance is your priority. TechHive's headline finding stands: it "can't match the power of other units in its price range." If you want a fan first and a purifier second, this is the wrong order of priorities for the TP09.
• You don't want to run it loud to feel airflow. Effective cooling requires speed six or above, and that's audibly louder than a dedicated tower fan running at a comparable airflow level.
• You won't use the deep air-quality data. If a simple clean/dirty indicator would satisfy you, you're paying for monitoring granularity that one experienced reviewer flatly called inessential.

How it compares

The TP09's closest comparison is its own sibling, the Dyson Purifier Cool TP07, which shares the same HEPA H13 and activated-carbon filtration, the same bladeless cooling and 350-degree oscillation, and the same app and voice-control ecosystem — minus the formaldehyde catalysis and dedicated sensor — for $200 less. Gavler's own TP07 review scores it a 9.0 and calls it the better-positioned value for most households, and the TP09's own product data agrees: it's "the right pick for buyers who would otherwise own a $400+ premium consumer-electronics product," not a default upgrade. At the opposite end of the list, the Dreo Nomad One ranks first with a 9.4 at just $90 — a DC-motor cooling-only fan with no purification at all. That comparison exists to make a point: if air treatment isn't a concern, nothing in Dyson's lineup, including the TP09, competes on cooling-per-dollar with a well-built dedicated fan.

The Gavler verdict

The Dyson Purifier Cool Formaldehyde TP09 is a real, working answer to a real problem — formaldehyde off-gassing in newer-construction homes — backed by a sensor that actually measures whether the fix is working. TechRadar's enthusiasm and Homes & Gardens' measured air-quality recovery times both support that the catalysis isn't marketing vapor. But at $700, with cooling performance that multiple independent testers describe as the weaker half of the product, and a monitoring suite one reviewer called more interesting than essential, this is a narrow-audience flagship. If formaldehyde from new furniture, flooring, or cabinetry is a documented concern in your home, the TP09 is the right premium pick on this list. Everyone else should buy the TP07 and keep the $200.

Common Questions

Is the Dyson Purifier Cool Formaldehyde TP09 worth it in 2026?

Only for a specific buyer. It ranks tenth on Gavler's Best Tower Fans list with a 7.6, and TechRadar called it 'worth the investment' — but TechHive's own verdict is blunter: it 'can't match the power of other units in its price range.' The TP09 earns its $700 price if you live in a newer-construction home with particle-board cabinetry, engineered flooring, or fresh adhesives — sources of the formaldehyde its catalytic filter continuously destroys. If that's not your situation, the case weakens fast.

What's the difference between the Dyson TP09 and the cheaper TP07?

The TP09 adds a dedicated formaldehyde sensor and a catalytic filter that breaks formaldehyde down into CO2 and water without ever needing replacement, on top of the same HEPA H13 and activated-carbon stack the TP07 already has. That upgrade costs about $200. For older-construction homes without a specific formaldehyde source, the Dyson Purifier Cool TP07 is the better-positioned value at $500.

Does the Dyson TP09 cool a room as well as a regular tower fan?

No, and multiple reviewers flag this directly. Homes & Gardens found that after weeks of testing, the TP09 'does a much better job at purifying than it does at cooling,' with effective airflow only kicking in at speed six or higher — and getting noticeably loud at that point. If cooling performance per dollar is your priority, a dedicated fan will beat it.