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Dyson Purifier Humidify+Cool HP09 Formaldehyde review: tried and tested
This review evaluates the Dyson Purifier Humidify+Cool Formaldehyde, a multi-functional device designed to purify, humidify, and cool the air. The product is Dyson's first purifying humidifying fan that also specifically targets formaldehyde, a common indoor pollutant often found in new furniture, flooring, and upholstery. This review covers the product's features, performance in various tests, and overall user experience over three months of testing.
The Dyson Purifier Humidify+Cool Formaldehyde features a 45W power consumption, a 2-meter cord, 10 speed settings, and 90-degree left-right oscillation. It has dimensions of H92.3 x W31.2 x D28cm and weighs 8.2 kg. A key feature is its HEPA H13 filter, capable of trapping microscopic particles. The device also includes a catalytic filter specifically designed to detect and destroy formaldehyde. It has a water tank with a gallon capacity, providing up to 36 hours of continuous humidification, with the water passing through a λ275nm UV light for sanitization before dispersion. Filter replacement is recommended annually at a cost of £65.
Assembly of the unit is minimal, primarily involving filling the water tank and inserting it. The product comes with a remote control, offering the same functions as the accompanying Dyson app. The app provides real-time air quality insights, although it requires proximity to the fan for connectivity. Pairing the app via Bluetooth is described as straightforward, and re-connection is not necessary after unplugging or moving the device.
Performance tests included spraying deodorant and burning a match to assess the purifier's responsiveness to airborne particles. In the deodorant test, the fan quickly detected PM2.5 particles and displayed their density on its sensor, with the app identifying them as Volatile Organic Compounds (VOCs). The device effectively reduced these levels. For the smoke test, the fan took slightly longer to register the fumes from a burnt match but significantly increased its activity once smoke was released, accurately identifying PM2.5 particles associated with smoke and industrial emissions.
For daily use, the Dyson Purifier Humidify+Cool Formaldehyde is intended to operate continuously to monitor and maintain air quality, humidity, and temperature. The 'auto' mode allows the device to adjust settings as needed, conserving energy. In 'Night mode,' the fan operates quietly and dims its display. The cooling function was noted to be effective, especially during warmer weather, with ten speed options. The device also includes a 'breeze mode' for varying airflow and a 'diffused mode' that humidifies without strong direct cooling, suitable for cooler months.
Positive aspects highlighted include the smart and user-friendly app, real-time statistical display, immediate purification capabilities, and effective cooling and humidification without aggressive airflow. The quiet operation in Night mode is also a benefit. The primary drawbacks are the unit's large size, which makes it less portable and takes up considerable space, and its high price point of £700. The long-term impact on energy bills was still under observation at the time of the review.
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