Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Dyson - Purifier Hot+Cool HP10 | Honeywell - HPA300 |
|---|---|---|
| CADR | 300 m³/h | 510 m³/h |
| Coverage | 50 m² | 44 m² |
| Min noise | 30 dB | 32 dB |
Between the Purifier Hot+Cool HP10 and HPA300, the Purifier Hot+Cool HP10 comes out ahead in coverage / min noise, while the HPA300 wins on cadr. Overall, the Purifier Hot+Cool HP10 scores 72.5 and the HPA300 scores 74.4 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (72.5 vs 74.4). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the Purifier Hot+Cool HP10 if you care most about coverage / min noise. The biggest gaps in its favor are coverage, min noise. The single most decisive one: Coverage — 13.64% more. 50 m² vs 44 m².
Pick the HPA300 if you care most about cadr. Its strongest claims are cadr. The single most decisive one: CADR — 70.00% more. 510 m³/h vs 300 m³/h.
Both ship with comparable true hepa h13+, activated carbon, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Dyson - Purifier Hot+Cool HP10 or Honeywell - HPA300?
Honeywell - HPA300 leads the current Mars Score by 1.9 points.The more useful decision is the trade-off behind that result: compare cadr, coverage, min noise against the way you will actually use the product.
Choose Dyson - Purifier Hot+Cool HP10 if…
Dyson - Purifier Hot+Cool HP10 has the measurable edge on coverage m2, noise db min.
Choose Honeywell - HPA300 if…
Honeywell - HPA300 has the measurable edge on cadr m3h.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Dyson - Purifier Hot+Cool HP10 wins
- ▲Coverage — 13.64% more. 50 m² vs 44 m².
- ▲Min noise — 2.00 dB less. 30 vs 32.
Why Honeywell - HPA300 wins
- ▲CADR — 70.00% more. 510 m³/h vs 300 m³/h.
Spec comparison
Performance
| Spec | Dyson - Purifier Hot+Cool HP10 | Honeywell - HPA300 |
|---|---|---|
| CADR | 300 m³/h | 510 m³/hlead |
| Coverage | 50 m²lead | 44 m² |
| True HEPA H13+ | true | true |
| Activated carbon | true | true |
Smart & Noise
| Spec | Dyson - Purifier Hot+Cool HP10 | Honeywell - HPA300 |
|---|---|---|
| Min noise | 30 dBlead | 32 dB |
| Air quality sensor | truelead | false |
| Smart app | truelead | false |