Dyson Purifier Humidify+Cool Formaldehyde PH04

Dyson Purifier Humidify+Cool Formaldehyde PH04 Review

Brand: Dyson
Released: November 4, 2021
Updated: 5 minutes ago
3.8
Overall review score Expert score: 4.3 Customer score: 3.3
319
Review evidence points
45
Scored features
63
Total reviews
17 expert / 46 customer

Bottom Line

Choose the Dyson PH04 for premium purification, humidifying, formaldehyde/VOC monitoring, and smart controls. Skip it if you need low cost, compact size, quiet max airflow, or proven pump reliability.

Best for

Best for people who want one premium device for air purification, humidity control, cooling airflow, and detailed air-quality monitoring, especially in dry homes or spaces with VOC, smoke, pollen, or allergen concerns.

Not for

Not ideal for buyers who mainly need a basic humidifier, have little floor space, dislike app-centered controls, need a quiet fan at maximum speed, or want low ownership costs.

Verdict

The Dyson Purifier Humidify+Cool Formaldehyde PH04 earns strong expert praise for its 3-in-1 design, sensitive air-quality reporting, VOC and formaldehyde focus, app controls, quiet lower settings, and comfortable humidification. Many customers also report cleaner air, allergy relief, better sleep, and stylish design. The tradeoff is real: customer reviews repeatedly mention high price, bulky size, weak humidifying in some rooms, loud high-speed operation, bad arrivals, pump-column failures, difficult support, and expensive filters or repairs. It looks strongest as a premium all-in-one air-care appliance for people who will use every function, not as a simple humidifier or budget purifier.

Compared in Reviews

Products reviewers directly compared with this model, grouped into quick takeaways.

Honeywell HCM350W

  • Worse: humidifier cleanliness and convenience The Dyson is framed as more expensive but cleaner and easier to use than the Honeywell.
  • Compared: humidifier alternative The Honeywell is described as cheaper and smaller, while Dyson is positioned as the quality choice.

HP09

  • Similar: air quality detection and purification The customer says its detection, reporting, and purification are comparable to their excellent HP09.
  • Better: PM2.5 clearing time The PH2 was close to the HP09 but took slightly longer to return to the initial PM2.5 reading.

Alen air purifier

  • Worse: air purification performance The customer says the Dyson surpasses their Alen air purifier.

Feature Scorecards

Summary

45 reviewed features
  • Very positive 4.5-5.0 40% 18 features
  • Positive 3.5-4.4 27% 12 features
  • Neutral 2.5-3.4 18% 8 features
  • Negative 1.5-2.4 9% 4 features
  • Very negative below 1.5 7% 3 features

Pros

  • 4.8
    based on 2 reviews
    pollen removal: 4.8, based on 2 reviews
    Review evidence is strongly positive.
  • 4.8
    based on 2 reviews
    VOC reduction: 4.8, based on 2 reviews
    Review evidence is strongly positive.
  • 4.8
    based on 1 review
    voice assistant compatibility: 4.8, based on 1 review
    Review evidence is strongly positive.
  • 4.7
    based on 5 reviews
    formaldehyde removal: 4.7, based on 5 reviews
    Review evidence is strongly positive.
  • 4.7
    based on 3 reviews
    auto mode performance: 4.7, based on 3 reviews
    Review evidence is strongly positive.
  • 4.7
    based on 1 review
    UV-C light effectiveness: 4.7, based on 1 review
    Review evidence is strongly positive.
  • 4.7
    based on 1 review
    Wi-Fi reliability: 4.7, based on 1 review
    Review evidence is strongly positive.
  • 4.7
    based on 2 reviews
    ease of use: 4.7, based on 2 reviews
    Review evidence is strongly positive.
  • 4.6
    based on 4 reviews
    sleep mode: 4.6, based on 4 reviews
    Review evidence is strongly positive.
  • 4.6
    based on 9 reviews
    app connectivity: 4.6, based on 9 reviews
    Review evidence is strongly positive.
  • 4.6
    based on 5 reviews
    allergen reduction: 4.6, based on 5 reviews
    Review evidence is strongly positive.
  • 4.6
    based on 1 review
    PM2.5 detection: 4.6, based on 1 review
    Review evidence is strongly positive.
  • 4.6
    based on 2 reviews
    dust removal: 4.6, based on 2 reviews
    Review evidence is strongly positive.
  • 4.6
    based on 2 reviews
    scheduling options: 4.6, based on 2 reviews
    Review evidence is strongly positive.
  • 4.5
    based on 4 reviews
    real-time air quality monitoring: 4.5, based on 4 reviews
    Review evidence is strongly positive.
  • 4.5
    based on 9 reviews
    design and appearance: 4.5, based on 9 reviews
    Review evidence is strongly positive.
  • 4.5
    based on 5 reviews
    smart features: 4.5, based on 5 reviews
    Review evidence is strongly positive.
  • 4.5
    based on 2 reviews
    energy efficiency: 4.5, based on 2 reviews
    Review evidence is strongly positive.
  • 4.4
    based on 12 reviews
    air circulation: 4.4, based on 12 reviews
    Review evidence is strongly positive.
  • 4.4
    based on 4 reviews
    display readability: 4.4, based on 4 reviews
    Review evidence is strongly positive.
  • 4.4
    based on 5 reviews
    air quality sensor accuracy: 4.4, based on 5 reviews
    Review evidence is strongly positive.
  • 4.4
    based on 25 reviews
    air purification performance: 4.4, based on 25 reviews
    Review evidence is strongly positive.
  • 4.3
    based on 1 review
    power consumption: 4.3, based on 1 review
    Review evidence is strongly positive.
  • 4.1
    based on 3 reviews
    smoke removal: 4.1, based on 3 reviews
    Review evidence is generally positive with some caveats.
  • 4.0
    based on 5 reviews
    adjustable vents: 4.0, based on 5 reviews
    Review evidence is generally positive with some caveats.
  • 3.9
    based on 4 reviews
    odor reduction: 3.9, based on 4 reviews
    Review evidence is generally positive with some caveats.
  • 3.6
    based on 3 reviews
    filter life: 3.6, based on 3 reviews
    Review evidence is mixed or context-dependent.
  • 3.5
    based on 10 reviews
    build quality: 3.5, based on 10 reviews
    Review evidence is mixed or context-dependent.
  • 3.5
    based on 14 reviews
    noise level: 3.5, based on 14 reviews
    Review evidence is mixed or context-dependent.
  • 3.5
    based on 36 reviews
    humidification performance: 3.5, based on 36 reviews
    Review evidence is mixed or context-dependent.

Cons

  • 3.4
    based on 9 reviews
    maintenance ease: 3.4, based on 9 reviews
    Review evidence is mixed or context-dependent.
  • 3.4
    based on 7 reviews
    remote control: 3.4, based on 7 reviews
    Review evidence is mixed or context-dependent.
  • 3.1
    based on 37 reviews
    value for money: 3.1, based on 37 reviews
    Review evidence is mixed or context-dependent.
  • 2.9
    based on 3 reviews
    portability: 2.9, based on 3 reviews
    Review evidence is mixed or context-dependent.
  • 2.9
    based on 2 reviews
    room coverage: 2.9, based on 2 reviews
    Review evidence is mixed or context-dependent.
  • 2.8
    based on 22 reviews
    overall satisfaction: 2.8, based on 22 reviews
    Review evidence is mixed or context-dependent.
  • 2.7
    based on 1 review
    particle removal effectiveness: 2.7, based on 1 review
    Review evidence is mixed or context-dependent.
  • 2.5
    based on 7 reviews
    size and footprint: 2.5, based on 7 reviews
    Review evidence is mostly negative.
  • 2.2
    based on 5 reviews
    filter replacement cost: 2.2, based on 5 reviews
    Review evidence is mostly negative.
  • 1.9
    based on 5 reviews
    durability: 1.9, based on 5 reviews
    Review evidence is mostly negative.
  • 1.5
    based on 15 reviews
    customer support: 1.5, based on 15 reviews
    Review evidence is mostly negative.
  • 1.5
    based on 13 reviews
    reliability: 1.5, based on 13 reviews
    Review evidence is mostly negative.
  • 1.4
    based on 2 reviews
    replacement experience: 1.4, based on 2 reviews
    Review evidence is mostly negative.
  • 1.3
    based on 8 reviews
    condition on arrival: 1.3, based on 8 reviews
    Review evidence is mostly negative.
  • 1.2
    based on 1 review
    documentation quality: 1.2, based on 1 review
    Review evidence is mostly negative.

Compared With Category Average

Compared with other Air Purifiers, this product is above average in UV-C light effectiveness, app connectivity, below average in reliability, overall satisfaction, durability.

Summary

8 compared features
  • Above average 0.4+ pts higher 25% 2 features
  • Same as average within 0.3 pts 0% 0 features
  • Below average 0.4+ pts lower 75% 6 features
Attribute This product Category average Difference
reliability 1.5 3.6 -2.1
UV-C light effectiveness 4.7 2.3 +2.4
overall satisfaction 2.8 4.3 -1.6
durability 1.9 3.6 -1.7
customer support 1.5 2.9 -1.4
particle removal effectiveness 2.7 4.4 -1.7
app connectivity 4.6 3.2 +1.4
documentation quality 1.2 2.7 -1.5

FAQ

Does the Dyson PH04 clean air well?

Most expert and positive customer reviews say it improves air quality, detects pollutants, and responds automatically. A few tests and customers found particle removal or purifier strength less impressive than dedicated purifiers.

Is the humidifier effective?

Evidence is split. Experts and some customers praised comfortable, hygienic humidification, while many negative customers said it barely raised humidity or stopped humidifying.

Is it quiet enough for bedrooms?

It is often praised as quiet on lower settings and night mode. High fan speeds, long runs, buzzing, or failure-related noises drew complaints.

Is the app useful?

Yes for most reviewers. The app is praised for real-time air-quality data, scheduling, remote control, humidity settings, and filter or cleaning reminders.

What are the main reliability complaints?

Customer complaints cluster around humidifier failure, pump-column replacement, oscillation failure, defective arrivals, and poor support or warranty experiences.

Is it worth the price?

It is worth it for reviewers who use purification, humidification, cooling, sensors, and smart controls together. It looks overpriced if used mainly as a humidifier or if reliability problems occur.

Sample Expert Reviews We Analyzed

These are a few of the reviews included in our analysis.

Video Reviews

Article Reviews

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Choose Coway Airmega 200M. It scores 5.0 vs 1.9 for durability, with a 4.1 overall score.

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