COWAY Air Purifiers for Large Room Whole Home Up to 4,253ft², 2 Sets of XL Washable Pre-Filters and HEPA Filters for Dual Purification, AQI, Turbo Mode, Timer, Wheels, 5yr Warranty, ProX(B)

This might be premature, but I read Condumers Report and this purifier was highest rated as well large cleaning volume. It is big so you need to think about location, but given it purifying volume anywhere is prob ok. The only real downer was expensive filters once a year and noise at low speed. I found the purifier was very very quiet in fact a low speed I needed to put my hand over vent to be sure it was running. So long term per CR it’s great and from my experience very very quiet. It’s a serious investment, but serious purifiers seem to run $500 to over $1000 with more noise and poorer performance. Given the potential for years of service (I hope at least 10) it seems like a good investment. I have not tried all the modes arrrggghhh so many so my views might change but out of the box it’s great.

Initially purchased an Airmega ProX and Airmega 350 to supplement our older Alen Breathesmart flex. Surprisingly, the larger ProX is the quietest of the three. It emits a soothing sound on level 2 and on level 1 it’s hard to hear it running when more than a few feet away. As someone that struggles with chronic allergies and allergy related headaches, the air feels very clean and our cat has been sleeping a short distance from the ProX due to the soothing sound. The main downsides of the unit are the filter costs and the size, however, Coway has been selling filters discounted on their website. The difference in build quality and sound compared to the 350 was enough for us to return the 350 and swap it with a second ProX for our oversized bedroom. We run both now at 24/7 on level 2 no problem, not audible during work meetings or anything.

I have a couple air purifiers that claim to work but really don’t. I live in an apartment with two air quality monitors one expensive and the other not so expensive but tells me what I need to know. So, after a few years using the unsatisfactory air purifiers I decided to purchase this unit ONLY because Consumer Reports gave it high remarks (I subscribe to CR and read the report). After using Coway Pro for a few weeks now the unit is just plane awesome. Now granted it is rather large for an apartment but I don’t care IT WORKS!!! Finally! One that works!. My apartment as a norm has no oder but occasionally fireplace smoke from the neighbors is noticeable but not now with the unit. The best win is my next door neighbor smokes and occasionally I can smell it but NOT NOW! My monitors are always in the green and hover around 0 to 1. The Coway Pro is very very quiet and has yet to increase the fan in auto mode it works so well. I really love this thing Consumer Reports was correct here. Update April: Three months in and still loving it. Occasionally I place it into turbo mode which will run for about fifteen minutes and then automatically default back to original setting. I love this feature since I really don’t want it to run in turbo mode for an extended period of time without my intervention. This ProX unit is so efficient that in turbo mode the air has been cleaned in about five minutes. Update June 2025: Had it for over a year now and yes, still loving it! I really have nothing more to add except I plan to purchase another for a different location. Well made, very quiet, still going strong as new.

While it is early with these units (I have a second one), I am rather impressed with the airflow and the much quieter volume compared to other air purifiers, including an older Airmega 400, Allerair (loud), Austin Air (varies but not quiet), and so on. While there is not a sufficient amount of carbon in this unit to be really meaningful, I'm mostly interested in the level of air movement and how much air it moves, and all of this is impressive. It is of course about the same size as a mini-fridge, so you do need the right place for it. There are no real smart features, so checking on filter life and when to clean the prefilters is up to you particularly if you turn off the lights.

This seemed to work well when it arrived. Not for long. Stopped running at all, which is pretty remarkable if you think about it, the only mechanical thing happening is an electric motor and a fan, not exactly cutting-edge technology. I've spent hours back and forth with customer service via email and phone, shot and edited and uploaded a video showing it definitely not working, etc etc. No help, no plan, not even a shipping label and good luck buddy. That's the better part of a thousand of my hard-earned dollars for this giant ugly thing that does nothing.

Worked great for a few weeks and then quit working. There was no owners manual provided, and when I contacted Coway to get an answer about what to do with an E 31 error code they responded asking for video, proof of purchase, a picture of the serial number label, etc. I sent all of that and have never received a response in spite of numerous messages left by me. Product support seems to be nonexistent, so now I’ve got a big piece of junk sitting in my bedroom doing nothing but taking up space. UPDATE: After posting this review I was contacted by someone at Coway and was able to return the unit and receive a replacement, which works perfectly (at least for now). The hang up seemed to be the video they required showing the problem. We scheduled a Facetime call and with that they were able to see what they wanted to see. Still a bit onerous, but at least a process that led to resolution. Again, it's a great item when it's working, quiet and efficient.

It has been operating 24/7, keeps the air clean, and is quiet.