Compare Humidifier
Dyson Purifier Humidify+Cool Formaldehyde PH04 scores higher on safety - here's why.
R3 scored the Dyson Purifier Humidify+Cool Formaldehyde PH04 7.8/10 and the Levoit Classic 300S Smart Ultrasonic Humidifier 5.7/10 on the same humidifier scoring system, weighing safety, efficacy, and usability. The Dyson Purifier Humidify+Cool Formaldehyde PH04 comes out ahead, led by its safety score (7.8/10 vs 5.7/10).
The most important dimensions, side by side.
See which one actually scores higher — and why
Free account unlocks full safety scores, spec-by-spec breakdown, and the R3 verdict on Dyson Purifier Humidify+Cool Formaldehyde PH04 vs Levoit Classic 300S Smart Ultrasonic Humidifier.
Unlock the full Dyson Purifier Humidify+Cool Formaldehyde PH04 vs Levoit Classic 300S Smart Ultrasonic Humidifier breakdown
Free account unlocks all safety scores, complete spec comparison, scoring rationale, and the R3 verdict on which one to buy.
Everything you need to make the call - who each one is for, and who should skip it.
Go for it if you...
You want the gold standard in clean humidification: evaporative technology, UV-C sterilization, and an auto-humidistat in one device.
You also need a full air purifier with HEPA H13 filtration and formaldehyde destruction for your living space.
You run it in an open-plan or large room during the day, not in a bedroom or nursery overnight.
The $1000 price is within your budget and you want everything handled by one device.
You are comfortable with hand-washing and a monthly citric acid descale routine.
You will use distilled or demineralized water exclusively — this removes the PM2.5 risk entirely.
App control and smart humidistat (VeSync app) are a priority for automating bedroom humidity.
Quiet operation matters most: 30 dB makes this the best-in-category option for infants and light sleepers.
Budget is a constraint and $80 is your ceiling for a large-room humidifier.
You want a large 6L tank that runs 8–12 hours overnight without refilling.
The main thing to know
The Dyson PH04 is the most feature-complete air quality device in this category — evaporative humidification, UV-C water sterilization, humidistat, HEPA H13 air purification, and formaldehyde destruction all in one machine. The tradeoffs are real: 62.4 dB makes it unsuitable for sleep environments, the tank is unspecified plastic with no BPA-free confirmation, and the $999 price is in a category of its own.
The Classic 300S scores lower than most mainstream reviews suggest because R3 weights air-quality risk above convenience features. Ultrasonic humidifiers with tap water generate measurable fine particulate matter indoors. If you use distilled water exclusively, that risk largely disappears — and the 300S delivers excellent app control, near-silent operation, and a large tank at the lowest price in the category.
Skip this if you...
You need a quiet humidifier for a nursery or bedroom — 62.4 dB will disrupt sleep.
The unspecified plastic tank (no BPA-free confirmation from Dyson) is a dealbreaker for your family.
You are looking for strong price-to-value — this is a luxury purchase.
Your household uses tap water and you are not prepared to switch to distilled — the white dust and fine particulate risk is real.
You want to know exactly what material your water tank is made of before purchasing.
A child or family member has asthma, respiratory sensitivities, or you live in a hard-water area.
Neither of these quite what you're looking for?
I've reviewed all Humidifier options at every price pointEvery Humidifier in our database is scored using R3's deterministic scoring system - the same inputs always produce the same score. For this comparison, we evaluated Dyson and Levoit across 3 independent criteria: Safety (89%), Efficacy (8%), Usability (3%). No sponsored rankings. No paid placements.
Straight answers - no sponsored content, no filler.
I'd start with Dyson Dyson Purifier Humidify+Cool Formaldehyde PH04 - it scored 7.8/10 overall in our scoring system. Safety is our top-weighted scoring pillar, followed by efficacy, and usability. Check which pillar matters most to your family and compare those specific scores.
R3 uses a deterministic scoring system - the same inputs always produce the same score. We evaluate each Humidifier across Safety, Efficacy, Usability using independently verified data. No sponsored rankings. No paid placements. Every score is fully reproducible.
Not necessarily. The overall score reflects how we weight those three pillars, but your priorities may differ. If you care most about safety, compare the safety scores directly. If budget drives your decision, the prices tell a clearer story. The "right" pick is the one that matches what matters most to your family.
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