Refurbished Dyson Purifier Humidifiers

Dyson's purifier humidifier range does three things at once: it purifies using HEPA H13 filtration and an activated carbon layer, hygienically humidifies using Dyson Ultraviolet Cleanse technology that removes 99.9% of bacteria from the water before it enters the air, and cools using Air Multiplier technology to project purified, humidified airflow across the room. Both models are fully sealed to HEPA H13 standard, meaning the entire machine is sealed, not just the filter. The decision between the two models comes down to one question: whether formaldehyde sensing and destruction is a specific requirement for your space.

Feature	Purifier Humidify+Cool PH03	Purifier Humidify+Cool Formaldehyde PH04
Purification	HEPA H13 + activated carbon	HEPA H13 + activated carbon + catalytic
Humidification	Yes, UV Cleanse technology	Yes, UV Cleanse technology
Cooling fan	Yes, Air Multiplier	Yes, Air Multiplier
Fully sealed to HEPA H13	Yes	Yes
Formaldehyde sensor	No	Yes, solid-state electrochemical
Formaldehyde destruction	No	Yes, catalytic filter
Air quality sensors	PM2.5, PM10, VOC, NO2, humidity	PM2.5, PM10, VOC, NO2, humidity + formaldehyde
Oscillation	Up to 90°	Up to 90°
Water tank capacity	1 gallon (up to 36 hrs)	1 gallon (up to 36 hrs)
App control	Yes (MyDyson)	Yes (MyDyson)
RRP (Dyson US)	~$820	~$920

RRP based on Dyson UK retail pricing at time of writing. Check individual listings for current Loop refurbished prices.

For most homes: the PH03 handles all standard air quality concerns. It purifies, hygienically humidifies, and cools, with continuous sensors monitoring PM2.5, PM10, VOCs, NO2, and humidity levels in real time. The machine automatically adjusts to maintain your target humidity level and responds to air quality changes without manual input. The one-gallon water tank provides up to 36 hours of humidification between refills, and the monthly deep clean cycle guides you through removing mineral buildup from the water system.

For new builds, renovations, or formaldehyde concerns: the PH04 adds a dedicated solid-state electrochemical sensor that monitors formaldehyde independently of the broader VOC sensor, and a catalytic filter that continuously destroys formaldehyde at a molecular level rather than trapping it. The catalytic filter does not need replacing for that pollutant. If the space has been recently built, renovated, or furnished with new composite wood products, flooring, or finishes that off-gas at room temperature, the PH04 is the more complete solution.

Dyson Certified Refurbished vs. Standard Refurbished

Two types of refurbished machines are sold on this page. The listing badge makes the distinction clear for every product.

Both options deliver a fully functional machine at a meaningful saving. For full details on each, visit the Dyson Certified Refurbished hub page.

What "Refurbished" Means for Dyson Purifier Humidifiers

A refurbished Dyson purifier humidifier is a previously owned machine that has been returned, inspected, and restored to full working order. It performs identically to a new unit. The motor, Air Multiplier mechanism, filtration system, UV Cleanse technology, sensors, and humidification system are all tested before dispatch and must pass before the machine ships.

Purifier humidifiers have more category-specific variables to assess at refurbishment than a standard air purifier or fan, because the water system introduces additional considerations alongside the air system. Three things matter most. First, filter condition: the HEPA H13 and activated carbon filter should have useful life remaining, and the listing confirms whether a new filter has been fitted. Second, seal integrity: both models are fully sealed to HEPA H13 standard, meaning the entire machine housing is sealed, not just the filter. This is checked during refurbishment. Third, water system condition: the internal water pathway, UV lamp, and evaporator are inspected and the deep clean cycle is run as part of the restoration process to remove any mineral deposits before dispatch.

What varies between refurbished machines is cosmetic condition, not performance. A Fair grade machine purifies and humidifies the same as a Premium grade machine. The difference is surface wear. Loop's condition grades are defined clearly on each listing so you know exactly what you are buying before checkout. Where the Dyson Certified badge appears, Dyson's own engineers handled the restoration using genuine parts, to Dyson's own production standards.

The Environmental Case for Buying Refurbished

Dyson machines are built to last. A refurbished Dyson purifier humidifier is the same machine returned to productive use rather than replaced, avoiding the materials, energy, and manufacturing emissions associated with producing a new unit. Loop ships every order in 100% recycled packaging with a 99% CO2 saving on delivery, verified by Greenly, a certified carbon accounting partner. Learn more about Loop's approach on the sustainability page.

Ready to Choose Your Dyson Purifier Humidifier?

If you want all-in-one purification, hygienic humidification, and cooling in a single appliance, both models deliver. The PH03 covers all standard air quality and humidity needs. The PH04 adds formaldehyde detection and destruction if that is a specific concern for your space. Every machine on this page is fully tested, backed by a 12-month warranty, and eligible for free 30-day returns.

Check the individual listing for cosmetic grade, filter condition, Dyson Certified or Loop standard badge, and current price. More models are added to this page regularly, so if your preferred machine isn't available right now, check back soon.