Blueair - Mini Max Air Purifier, 2-pack

That is an absolutely SHIT product and it's shameful Costco is selling them. You see how it says it cleans the air in a 432 ft² room in 60 Minutes? That means it's actually rated to clean a 100 square foot room, at best, when it's on high. It's an utter garbage product and shouldn't exist. They're only produced to take advantage of people that don't understand air purifiers. Introducing something like this into your home with have an extremely negligible impact on air pollution, while raising the noise pollution in your home. Again, on the loudest fan setting, it's rated to clean a 100 square feet room. $120 at Costco is about the least you can spend per bedroom, and it will be loud. You need to spend more on a larger unit if you want to turn the fan down to a reasonable volume. I've got severe allergies and starting using air purifiers in the 90's, and you're going to need to spend a big chunk of change if you want clean air at a low volume level, and it's going to take up quite a bit of floor space.

I have one in a 14x10 kids room and it’s been great for two years. The winix ones are better for more space

Box fans with filters are cheap and foolproof and BIFL or close to it, but if you want something prettier I’ve had good luck with the BlueAir from Costco. Dead simple and effective in bedrooms.  https://en.wikipedia.org/wiki/Corsi%E2%80%93Rosenthal_Box https://www.costco.com/blue-pure-mini-max-air-purifier%2C-2-pack-by-blueair.product.4000339230.html

I have them and have had two other blueair purifiers for a couple of years. To quote from another reddit thread on the same topic: Blueair air filters meet CARB (California Air Resources Board) certification standards, so they emit less than 50 parts per billion of ozone as an upper limit. It seems that some people feel there is no safe amount of ozone generation and claim adverse health effects (lung/throat irritation) but this will be specific from person to person. Knowing Costco has a generous return policy, why not get it and if it makes you feel worse then return it?

I second the Blueair purifiers. I have the 211+ non auto in my living room and the smaller versions in my bedrooms. I've had the 211+ running for about ten years and still going strong. The smaller ones I had to replace recently. I got the table top Mini Max through Costco in a 2-pack and I regret that size. I'll get the smaller standing 411 ones again next time.

For whatever it is worth, purchased this two pack for $100 from Costco “blue pure mini max” to put in our less inhabited rooms of the home. We have coway in primary living spaces. https://www.costco.com/Blue%20Pure%20Mini%20Max%20Air%20Purifier,%202-pack%20By%20Blueair.product.1896710.html?COSTID=iosapp_25.8.2&TRACKING=NO&adobe_mc=TS%3D1755361137%7CMCMID%3D47448641111624073557868459186739136500%7CMCORGID%3D97B21CFE5329614E0A490D45@AdobeOrg&sh=true&nf=true

Again another vote for Blueair, I have the max mini for our bedroom and whilst it isn't smart so doesn't show in Home assistant I do have it linked to a window sensor so it only comes on when the bedroom window is closed, but also set to run during the night regardless. Works well and definitely helps with the dust and makes the air feel cleaner.

I have a BlueAir mini right by him and a larger blue air right outside his room. 

BlueAir Max Pure

Love my blueair - i have 3

I have tried and gotten rid of Bluair and levoit- just inadequate performance and louder than I like. I replaced them with Medify and have been very happy with the switch. If memory serves I have an ma-50 in the living room and ma-40 is each bedroom.