Dyson Air Purifier and Humidifier

For a new Dyson air purifier and humidifier, choose the PH2 De-NOx White/Gold: its supplied K-Carbon filter, formaldehyde-specific sensing and MyDyson controls make it our default family pick. The PH04 White/Gold is the refurbished alternative to compare; consider PH03 for an older connected machine and PH3A Autoreact for remote-led operation only after checking condition and contents. Start with the exact model and finish with the filter and water-system order below.

Quick picks: the US versions compared

Official US pages checked November 3, 2026. Stock descriptions below are a snapshot of Dyson's pages; recheck the linked configuration before ordering.

Compare specifications and all conditions

PH2 De-NOx White/Gold — best new purchase

Controls

Remote, LCD, MyDyson

Formaldehyde-specific feature

Dedicated readout and catalytic filter

Supplied replaceable air filter

HEPA + K-Carbon

All specifications

Dyson availability at check

In stock

PH04 White/Gold — refurbished alternative

Controls

Remote, LCD, MyDyson

Formaldehyde-specific feature

Solid-state sensor and catalytic filter

Supplied replaceable air filter

Glass HEPA + activated carbon

All specifications

Dyson availability at check

New out of stock; refurbished in stock

PH03 White/Silver — conditional older app option

Controls

Remote, LCD, MyDyson

Formaldehyde-specific feature

No dedicated feature documented

Supplied replaceable air filter

Glass HEPA + activated carbon

All specifications

Dyson availability at check

New out of stock

PH3A White/Nickel — conditional remote option

Controls

Remote, LCD; app claim unresolved

Formaldehyde-specific feature

No dedicated feature documented

Supplied replaceable air filter

Glass HEPA + activated carbon

All specifications

Dyson availability at check

New out of stock

Full comparison table ↔

Swipe to compare. Row labels stay visible.

Version and our pick	Controls	Formaldehyde-specific feature	Supplied replaceable air filter	Dyson availability at check
PH2 De-NOx White/Gold — best new purchase	Remote, LCD, MyDyson	Dedicated readout and catalytic filter	HEPA + K-Carbon	In stock
PH04 White/Gold — refurbished alternative	Remote, LCD, MyDyson	Solid-state sensor and catalytic filter	Glass HEPA + activated carbon	New out of stock; refurbished in stock
PH03 White/Silver — conditional older app option	Remote, LCD, MyDyson	No dedicated feature documented	Glass HEPA + activated carbon	New out of stock
PH3A White/Nickel — conditional remote option	Remote, LCD; app claim unresolved	No dedicated feature documented	Glass HEPA + activated carbon	New out of stock

Version and our pick	Controls	Formaldehyde-specific feature	Supplied replaceable air filter	Dyson availability at check
PH2 De-NOx White/Gold — best new purchase	Remote, LCD, MyDyson	Dedicated readout and catalytic filter	HEPA + K-Carbon	In stock
PH04 White/Gold — refurbished alternative	Remote, LCD, MyDyson	Solid-state sensor and catalytic filter	Glass HEPA + activated carbon	New out of stock; refurbished in stock
PH03 White/Silver — conditional older app option	Remote, LCD, MyDyson	No dedicated feature documented	Glass HEPA + activated carbon	New out of stock
PH3A White/Nickel — conditional remote option	Remote, LCD; app claim unresolved	No dedicated feature documented	Glass HEPA + activated carbon	New out of stock

Dyson's support directory lists these as separate families. A support entry establishes which instructions to use; check the actual product page for an orderable machine.

For the PH2, Dyson rates the full tank for up to 36 hours at fan speed 1 and recommends replacing HEPA+K-Carbon every 12 months, based on 12 hours' daily use, with actual life dependent on use and pollution.

• Up to 36 hPH2 full-tank humidification at fan speed 1
• 12 monthsPH2 HEPA+K-Carbon guidance at 12 hours of daily use

Best new purchase: PH2 De-NOx White/Gold

This is the straightforward starting point if you want the current combined machine and connected controls. The exact US White/Gold configuration is 544589-01; Nickel/Gold is 602848-01. Match the configuration as well as the family name when comparing bundles.

The White/Gold in-box list names the machine, combined HEPA+K-Carbon filter and magnetic remote. Its tank is described as one gallon. Keep the replacement filter separate from the catalytic filter, which Dyson says never needs replacing.

A maker inconsistency matters here: the PH2 page claims 50% more NO₂ adsorption, while the K-Carbon filter page also carries a footnote saying three times more NO₂. We give the upgrade no performance multiplier because those published claims conflict.

See the exact PH2 White/Gold kit at Dyson · PH2 controls and user manual

Best refurbished alternative: PH04 White/Gold

The PH04 adds a dedicated solid-state formaldehyde sensor and catalytic filter to the standard HEPA/carbon arrangement. Its new-product page showed out of stock, while Dyson's Certified Refurbished White/Gold page showed an available machine. Choose it only if the condition and terms suit you.

The refurbished box lists the machine, remote and Glass HEPA/activated-carbon filter. Dyson specifies a six-month parts-and-labor warranty for refurbished purifiers and humidifiers, and says Renewed sales are final. Include those terms in the comparison, especially for a gift.

See the refurbished PH04 White/Gold kit at Dyson · PH04 controls and user manual

Older connected alternative: PH03 White/Silver

The PH03 US page lists remote, MyDyson and compatible voice controls, with the Glass HEPA/activated-carbon filter and remote included. It showed out of stock. Check any other offer separately for stock and condition; a supported model is not automatically a current new purchase.

Its owner guide lists particle, VOC, NO₂, temperature and humidity screens, without the dedicated HCHO readout documented for PH04. The PH03 retail page also lists formaldehyde among household pollutants; we do not read that generic list as proof of a formaldehyde sensor or catalytic stage.

PH03 model support · PH03 controls and user manual

Remote-led alternative: PH3A Autoreact White/Nickel

Consider the PH3A if you intend to use a remote and the machine's LCD. Its dedicated guide documents automatic purification/humidification, remote airflow selection and a remote sleep timer. The US product page showed out of stock and lists a remote and Glass HEPA/activated-carbon filter in the box.

Do not buy it for promised app scheduling. Its retail page has a generic Wi-Fi/app footnote, but the model guide documents remote operation and Dyson's connected-machine list omits PH3A. Those pages are inconsistent. Require model-specific confirmation from Dyson before relying on a seller's connectivity claim.

Sensors, controls and room fit

Across the model guides, the useful everyday readouts are PM2.5, PM10, VOCs, NO₂, temperature and relative humidity. PH04 and PH2 additionally document a formaldehyde-specific readout. Check the named screen or sensor rather than assuming every pollutant in a marketing glossary is individually measured.

For a recipient who wants phone control, favor PH2 or a verified PH03/PH04 configuration. Older owner pages call the app Dyson Link; current product pages call it MyDyson. Include the working remote in any used or refurbished order, and verify app/device compatibility before gifting.

Dyson describes these as single-room machines; its PH2 guide asks for a few feet of clearance on every side, away from radiators and air vents. Night mode uses quieter settings and a dimmed display. We have no comparable low-speed sound measurements or smoke CADR figures in the cited model specifications, so we do not rank their noise or room-cleaning speed. For CADR-led alternatives, see our air purifier guide.

The exact filter and water-system order

Use the configuration columns below when ordering. The tank and pump pages explicitly list PH2 White/Gold, PH04 White/Gold, PH03 White/Silver and PH3A White/Nickel; recheck compatibility for a different finish or regional unit.

Two compatibility traps: the PH3A spares directory lists evaporator 970718-01, but that part's own compatibility list omits PH3A. Confirm it against the serial number before ordering. The standard-filter page also calls PH04 “Cryptomic,” whereas the model directory calls it “Formaldehyde”; use the PH04 code and matching support page when resolving that naming conflict.

K-Carbon compatibility is explicitly documented for all the families above. Replacing that consumable does not establish an upgrade to a machine's sensors, catalytic hardware or connectivity. Our recommendation for an existing PH04 is to investigate the listed replacement filter before replacing the whole machine solely for the supplied filter type.

Refilling, humidity and the recurring maintenance kit

The PH2 can run as a purifier fan with humidification switched off, and its Auto modes manage purification and humidity. Plan around the full tank's qualified runtime above and follow its refill prompt rather than assuming it will last an identical time at every setting.

For ongoing supplies, identify the air filter and have 150g of citric acid per prompted PH2 Deep clean cycle available. PH03/PH04/PH3A support also lists the branded Cleaning kit 970919-01. Buy an evaporator, tank or pump to replace a missing or damaged component after checking compatibility; the cited guides do not assign those parts an annual replacement schedule.

PH2 cleaning prompts depend on water hardness: monthly in hard-water areas, less often in softer water. Its guide specifies citric acid and points to the matching manual. The detailed PH04 instructions fill with cold water, dissolve the citric acid, put the evaporator in the tank, run the guided cycle, then rinse and reassemble. They explicitly require keeping the electrically connected tank cap dry. Follow your own model's sequence.

For the broader choice between appliances, read air purifier vs humidifier; for the water-delivery designs, see evaporative vs ultrasonic humidifiers.

Black Friday and Cyber Monday: check the complete order

Compare the same model, finish, condition and included parts before deciding that an offer is better. In particular, compare a new PH2 with a refurbished PH04 only after accounting for the latter's shorter warranty and final-sale terms.

1. 1

   Match the machine

   Confirm the full family name, US configuration and condition.

2. 2

   Check the box

   Confirm the listed filter and working remote are included.

3. 3

   Check the water system

   Verify the tank, pump and evaporator; resolve the PH3A evaporator conflict before buying a spare.

4. 4

   Read the condition terms

   Dyson Renewed purifiers carry a six-month warranty and final-sale terms.

How we choose

This is document-based research, without physical product testing. We matched US product pages to model-specific owner guides, in-box lists and spare-part compatibility pages. Our preference for PH2 follows its current new-product availability and documented controls; older models are conditional alternatives. We expose conflicting maker claims instead of filling gaps with another generation's specifications.

Verdict

Choose PH2 De-NOx White/Gold for a new machine with K-Carbon and connected controls. Compare Dyson-refurbished PH04 White/Gold if you accept its condition and terms. Consider PH03 only against a verified older offer, and PH3A for remote operation with its connectivity caveat understood. Finish the order by checking the exact filter and water-system parts.

Official sources

Model specifications, package contents, stock labels and support instructions checked November 3, 2026:

• Dyson US model pages: PH2 White/Gold, PH2 Nickel/Gold, PH04 new, PH04 refurbished, PH03 and PH3A.
• Model-specific controls, maintenance and manual links: PH2, PH04, PH03 and PH3A; connected-machine list.
• Exact replacements: K-Carbon filter, standard filter, evaporator, tank, pump, cleaning kit and PH3A-specific spares.