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The SonoHealth AirPro and the Winix 5500-2 are both popular mid-priced purifiers, but they clean the air differently: the AirPro uses medical-grade HEPA 14 (99.995% at 0.3 microns) plus fully enclosed, ozone-free UV-C, while the Winix 5500-2 pairs a True HEPA (99.97%) filter with a washable activated-carbon filter and an optional PlasmaWave ionizer. The AirPro is graded higher and is ozone-free by design; the Winix is AHAM-rated with a well-known track record and an ionizer you can switch off.

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Quick comparison

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Filtration: HEPA 14 vs. True HEPA

The Winix 5500-2 is a well-regarded True HEPA purifier that captures 99.97% of particles at 0.3 microns. The AirPro’s HEPA 14 filter is rated to 99.995% at 0.3 microns (EN 1822) — about 10x fewer particles passing through at the hardest-to-catch size. Both add activated carbon for odors, smoke, and VOCs; the Winix uses a washable carbon pre-filter, while the AirPro’s carbon is part of its sealed 3-stage cartridge. Compare grades in HEPA 14 vs. True HEPA.

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UV-C vs. PlasmaWave: the key safety difference

This is where the two diverge most. The AirPro adds a sealed UV-C lamp that targets microorganisms after filtration, with no ozone and no user exposure. The Winix’s extra stage is PlasmaWave, a bipolar ionization feature that is optional and can be turned off — worth knowing because ionizers can produce trace ozone when active.
If anyone in your home has asthma or another respiratory condition, avoid running any ionizer, and choose purifiers that rely on mechanical filtration. The AirPro is ozone-free by design (no ionizer); on the Winix, keep PlasmaWave switched off. See HEPA vs. Ionizer Air Purifiers.

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Coverage and noise

The Winix 5500-2 is AHAM-rated for about 360 sq ft with an auto mode driven by its air-quality sensor. SonoHealth rates the AirPro at 430 sq ft in 10 minutes and up to 1,200 sq ft in 30 minutes (measured as area over time rather than a single published CADR), with a 25 dB Night Mode for bedrooms. Because the brands publish coverage differently, size to your actual room using Room Coverage and CADR vs. ACH Explained.

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Which should you buy?

  • Choose the AirPro for the higher HEPA 14 grade, built-in ozone-free UV-C, larger rated coverage, a 25 dB night mode, a longer (and optionally lifetime) warranty, and a 60-day free trial.
  • Choose the Winix 5500-2 if you want a proven, Energy Star, AHAM-verified True HEPA unit with an auto sensor and a washable carbon filter, and you don’t need UV-C (keep PlasmaWave off for sensitive lungs).

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Bottom line

Both are solid, ozone-free-capable purifiers. The AirPro leads on filtration grade, UV-C, coverage, warranty, and trial period at $169; the Winix 5500-2 is a dependable True HEPA option best used with PlasmaWave off. SonoHealth is a Google Top Quality Store (sitewide 4.7 stars across 673 verified reviews). The AirPro is a consumer wellness appliance that reduces airborne particles; it is not a medical device and does not treat any condition. Talk to a clinician about specific respiratory concerns.
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