I have owned the Winix 5500-2 for four years. It sits in the corner of my home office, runs ten hours a day on auto, and the only thing I have ever done to maintain it is take the pre-filter outside once a month and bang the cat hair off of it. I have recommended it to three friends, two of whom now own one. Then in May of last year Winix discontinued it in the US, and I have spent the year since explaining to people why they should still try to find one on the shelf.
The pitch is unglamorous and exactly correct: this purifier was the best value in the category for the better part of a decade. The CADR is in the 240-cfm range across dust, smoke, and pollen, which is enough for a 360-square-foot room at four-and-a-half air changes per hour — meaning a real bedroom or a medium living room, fully covered, without you noticing the unit is running. The True HEPA is AHAM Verified at 99.99 percent at 0.3 microns, which is the certification that actually matters and which a lot of competitors quietly skip.
The two features I have not seen on any cheaper purifier since: the ionizer is genuinely disable-able, with a physical button on the top, and the carbon filter is washable. Most carbon filters at this price point are impregnated fabric — the carbon is essentially printed on, you toss the filter when it dies. The Winix uses a pelleted carbon cartridge in a plastic frame, which means you can rinse it under the tap when it stops working as well, dry it overnight, and put it back. I have done this maybe four times in four years and gotten more life out of the unit because of it.
The pre-filter is also washable — most purifiers ship a permanent-ish foam pre-filter that you replace, the Winix ships a mesh you take outside and beat. Filter math: if you buy genuine HEPAs at $79 a year, running cost is around $138 with electricity. If you buy third-party HEPAs at the cheap end (as low as $15 a year), running cost drops below $80. I have used both and the third-party filters work fine — I would not run them in a HealthPro Plus, but in a Winix I would not hesitate.
The complaints are minor. The unit uses more electricity than newer designs — closer to 70 watts on high than the Coway Airmega's 60, in a purifier doing significantly less air. There is no settings memory after power loss, which means if your power blips, the PlasmaWave ionizer reactivates whether you had it off or not. No app, no Wi-Fi, no scheduling beyond a basic four-hour timer. None of this is dealbreaking; all of it is part of why the unit is cheap.
The noise is fine. The four speeds run from about 39 dB on low to 59 dB on high. On the second speed I cannot hear it from across the room and the auto mode mostly stays at speed one and two. The remote is bad in the way every remote at this price is bad — it works.
The discontinuation news is the asterisk now. Winix has confirmed the 5500-2 is gone in the US and Canada and the successor 5510 is the replacement they want you to buy. The 5510 is fine but loses the washable carbon filter, which was the feature I cared most about. Winix has also confirmed they will manufacture 5500-2 replacement filters until 2032, so if you can find a unit at retail or used, the consumables are safe for the next several years.
Verdict: Buy this if you can still find one in stock and you want the value-king purifier of the decade. If you are shopping today, the Winix 5510 is the natural fallback, or step up to the Levoit Core 600S for app control.