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The main difference is filtration grade and sterilization: the SonoHealth AirPro uses medical-grade HEPA 14 (99.995% at 0.3 microns, EN 1822) plus fully enclosed UV-C, while the Honeywell HPA300 is a proven True HEPA (H13-class, 99.97% at 0.3 microns) purifier with a strong fan but no UV-C stage. Honeywell is a trusted, widely available workhorse; the AirPro adds a higher filtration grade, UV-C, quiet 25 dB nights, and a 60-day trial at $169.

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Quick comparison

Competitor specifications above are from public marketing and may change by model or revision; confirm current details with the manufacturer. The AirPro is a consumer wellness appliance, not a medical device or a treatment for any condition.

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Filtration: HEPA 14 vs. True HEPA

The HPA300 uses a genuine True HEPA filter rated to 99.97% at 0.3 microns (the H13 class). The AirPro’s HEPA 14 filter is certified to 99.995% at 0.3 microns under EN 1822 — roughly 10× fewer particles passing through at the hardest-to-trap size, plus capture of 99.9% down to 0.1 microns. For general dust, True HEPA is plenty; for smoke, ultrafine allergens, or sensitive households the higher grade matters. See HEPA 14 vs. True HEPA.

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Noise and night use

Honeywell’s HPA300 moves a lot of air but is noticeably louder on its higher settings. The AirPro is engineered for quiet operation, with a 25 dB Night Mode and dimmed lights that suit bedrooms and nurseries. If you plan to run a purifier while you sleep, this is a meaningful difference.

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Where Honeywell leads

The HPA300 is backed by a long-standing brand, a 5-year limited warranty, and very wide retail availability, and its powerful fan clears a mid-size room quickly. If you prefer a simple, no-frills True HEPA workhorse from a legacy brand, it’s a solid pick.

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Which should you buy?

  • Choose the AirPro for the higher HEPA 14 grade, built-in enclosed UV-C, quiet 25 dB nights, smart filter tracking, and a 60-day risk-free trial at $169.
  • Choose the Honeywell HPA300 if you want a legacy-brand True HEPA unit with a strong fan and a long warranty, and don’t need UV-C or an ultra-quiet night mode.

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Bottom line

The AirPro delivers HEPA 14 filtration and enclosed UV-C at $169, a grade above the HPA300’s True HEPA and with germicidal UV-C the Honeywell lacks. The HPA300 remains a dependable True HEPA choice with a long warranty. SonoHealth backs the AirPro with a 60-day free trial and is a Google Top Quality Store (sitewide 4.7 stars, 673 verified reviews).
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