If you want better noise level
Choose Dyson Purifier Big+Quiet Formaldehyde BP04. It scores 4.8 vs 3.5 for noise level, with a 4.1 overall score.
Dyson Purifier Humidify+Cool Formaldehyde PH04 Air Purifier Review
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.
Feature Scorecards
Summary
45 reviewed features-
Very positive 4.5-5.018 (40%)
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Positive 3.5-4.412 (27%)
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Neutral 2.5-3.48 (18%)
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Negative 1.5-2.44 (9%)
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Very negative below 1.53 (7%)
Pros
-
Review evidence is strongly positive.
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Review evidence is strongly positive.
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Review evidence is strongly positive.
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Review evidence is strongly positive.
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Review evidence is strongly positive.
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Review evidence is strongly positive.
Cons
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Review evidence is mostly negative.
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Review evidence is mostly negative.
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Review evidence is mostly negative.
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Review evidence is mostly negative.
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Review evidence is mostly negative.
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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, Wi-Fi reliability, near average in humidification performance, air purification performance, below average in documentation quality, overall satisfaction, customer support.
Comparison summary
45 compared features-
Above average 0.4+ pts higher17 (38%)
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Same as average within 0.3 pts12 (27%)
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Below average 0.4+ pts lower16 (36%)
Largest category differences
| Attribute | This product | Category average | Difference |
|---|---|---|---|
| documentation quality | 1.2 | 3.4 | -2.2 |
| overall satisfaction | 2.8 | 4.3 | -1.5 |
| customer support | 1.5 | 3.0 | -1.6 |
| reliability | 1.5 | 3.0 | -1.6 |
| UV-C light effectiveness | 4.7 | 2.9 | +1.8 |
| app connectivity | 4.6 | 3.2 | +1.4 |
| replacement experience | 1.4 | 3.0 | -1.6 |
| size and footprint | 2.5 | 4.0 | -1.5 |
Consider This Instead
If you want better customer support
Choose Dyson Purifier Hot+Cool Formaldehyde, HP09. It scores 5.0 vs 1.5 for customer support, with a 3.7 overall score.
If you want better air circulation
Choose Dyson Purifier Big+Quiet Formaldehyde BP03. It scores 5.0 vs 4.4 for air circulation, with a 4.2 overall score.
If you want better condition on arrival
Choose Nuwave Forever, 47265. It scores 4.7 vs 1.3 for condition on arrival, with a 4.6 overall score.
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.
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
YouTube - Erin Lawrence
- Review score
- 4.0
YouTube - Steve & Erika Puvalowski
- Review score
- 4.7
Article Reviews
hunker.com
- Review score
- 4.0
idealhome.co.uk
- Review score
- 4.2
galaxus.ch
- Review score
- 4.5
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