Coway - Airmega ProX

Sorry, there's some misinformation here. Roughly speaking, purifier sizing depends on room volume, pollution concentrations, and CADRs (although IQAir does not list CADRs for most of its models). A lower airflow speed or setting means slower and/or possibly ineffective cleaning. This becomes more pronounced as room volume or pollution concentrations increase. The [IQAir HealthPro Plus XE](https://cdn.shopify.com/s/files/1/0065/4780/0182/files/HP_PLUS_B2C_Product_Overview_v01_2025.pdf) has a top "Nominal Flow Rate" of 300 CFM.* Unfortunately this is also a fairly loud unit. *Document says 300 m^(3)/h, but I think this is a misprint. See the tech specs for the older version of this model, the [IQAir HealthPro Plus NE](https://cdn.shopify.com/s/files/1/0065/4780/0182/files/Tech-Specs_HPP-NE_120V_120924.pdf). The Amazon screen capture is incorrect. The [HyperHEPA filter](https://www.iqair.com/us/products/replacement-filters/hyperhepa-h12-h13-f3) is not H14 class. IQAir lists it as "HyperHEPA H12/H13". But to be precise, there is no H12 filter class designation in the [EN 1822-1:2019 High efficiency air filters (EPA, HEPA and ULPA) - Part 1: Classification, performance testing, marking standard](https://www.airum.com/frontend/immagini/files/EN%201822-1.PDF). There is only E12, whose filter group is Efficient Particulate Air (EPA). The [HealthPro Plus 10 year warranty](https://www.iqair.com/us/support/iqair-warranty-coverage) applies if you register the purifier *and* maintain a filter subscription OR provide filters' proof of purchases. I think IQAir makes high quality units with tight manufacturing tolerances. But they're not as powerful as the Smart Air Blast MKII or Coway Airmega ProX.

Aren’t ionizers kind of bunk though? I’m happy with my coway prox fwiw - anyone thinking of buying

If aesthetics and noise levels are important to you, Coway ProX for the main living space (assuming it’s large-ish) and any Coway “medium spaces” unit (use their website to filter) for the Bedroom. Total ~$1k. If aesthetics and noise levels are not important, two AirFanta 3Pro, run on Medium-High, about $400. If aesthetics are not important but noise is, four AirFanta 3Pro, run on Low or Medium-Low, about $800. If your budget is a little flexible and you want the highest CADR with the smallest footprint and lowest noise, a SMART AIR BLAST - MKII for the main living space (about $1,100) and any Coway “medium spaces” unit. Total, about $1,500.

FWIW, I have bad environmental allergies to chemicals and smoke, both of which block my nasal passages and result in sinus infections. For years, the air filter I used was the IQ Air HealthPro Plus, which is modestly effective. More recently, I bought a Coway Airmega ProX, which seems to be more effective for me. It’s a big filter that is made for large spaces and it filters smoke and VOCs with a carbon filter. On the high setting, it filters the air in a 1,000 square foot room 4 times per hour. In your bedroom, which is small, it would take less time to filter the air. Others are right in telling you to escalate your complaint or move out. But I just figured I would chime in to say that Amazon has a 30-day return policy, so if you want to test out an air purifier like the Coway, you can likely return it and get your money back.

I have the Winix C909 and Coway Pro X. Yes they are completely in terms of size and need, but they both feel like nice quality to me. I use each in the appropriate size room and it feels the same to me 🤷🏻‍♂️. Only bought both when they were on sale though. I personally think Coway is only worth it on a good sale

I have tried a few over the years and the ones that actually made a noticeable difference for me were the bigger HEPA units with high airflow. Coway has been the most consistent in my house. Once I sized it properly for the room, dust dropped and the air felt lighter within a few days.

A True HEPA H13 filter is non-negotiable, as it traps 99.97% of harmful pollutants like PM2.5, allergens, and viruses. First things first, buy an [AQI reader/monitor](https://amzn.to/4fsfyrx) in case the air purifier is not fitted with one, or you want a comparison. If you prefer something that's not noisy and also economical, you can go for the [Coway Professional Air Purifier](https://amzn.to/47aYClJ). Effective and works as expected. It's also highly not recommended to go cheap when it comes to air purifiers, but if you want to restrict your budget, here you go: [Honeywell Air Purifier for Home & Office](https://amzn.to/40Ytq78) For portable air purifiers, go for [AirTamer A320 Rechargeable Personal Air Purifier](https://amzn.to/3H4EJnz) if you're looking for features.

Nothing at that cost will cover 800 square feet. For allergies you really need around 4-6 air changes an hour to be most effective. You’d need like 500-600 CFM. That’s on the level of the coway airmega proX for one singular air purifier. Just the bedroom though is much more reasonable. I have 2 coway air mega 1512’s with the allergen filters for my partner who has a cat allergy (I have a cat) in the two bedrooms of my apartment and it made a huge difference. I got them recently on sale for 169$ each (allergen filter was an additional like 40-50$) The went from waking up in the morning coughing up a lung, to sleeping through the night peacefully I also have a few medify air purifiers. They do much better with smells so that’s in my main area, I got the 1512’s specifically because of their special allergen filters. The 350 also has that but is significantly more expensive. Really seems to do wonders for cat dander

The only Coway that comes close to providing 5 air changes per hour in a 900 sq ft space is the Coway Airmega Pro X. Energy Star has CADR and recommended room size for Coway devices based on 5 air changes an hour. [https://www.energystar.gov/productfinder/product/certified-room-air-cleaners/results?formId=0304900d-f3f8-46b0-87df-a67bf35eaadd&scrollTo=1267.878662109375&search\_text=&brand\_name\_isopen=1&is\_most\_efficient\_filter=0&markets\_filter=United+States&zip\_code\_filter=&product\_types=Select+a+Product+Category&sort\_by=smoke\_free\_clean\_air\_delivery\_1&sort\_direction=desc¤tZipCode=&page\_number=0&lastpage=0&brand\_name\_filter=Coway](https://www.energystar.gov/productfinder/product/certified-room-air-cleaners/results?formId=0304900d-f3f8-46b0-87df-a67bf35eaadd&scrollTo=1267.878662109375&search_text=&brand_name_isopen=1&is_most_efficient_filter=0&markets_filter=United+States&zip_code_filter=&product_types=Select+a+Product+Category&sort_by=smoke_free_clean_air_delivery_1&sort_direction=desc¤tZipCode=&page_number=0&lastpage=0&brand_name_filter=Coway) I know Coway and many other brands likes to promote the larger square footage but you're only getting one air change an hour. The Pro X for example is marketed at over 4,000 square feet but it's only one air change. That won't be enough to help with odors.

Coway ProX is a bit outside your budget but truly fits all the criteria - very quiet, high CADR, large prefilters to collect a lot of dust and can be easily cleaned