Pure 411

I also have two blue air 411 for each bedroom. Can't recommend them enough. They just do the job and filters are pretty cheap. 

Plus one for this. I have two blue air 411s in bedrooms and they are very good and new filters aren’t too expensive either. 

I have a 411 and it died (wouldn’t run, connect to anything, blinking red light). Their customer support was very bad, multiple times just stopped responding to me until it was out of warranty. Because I had old case numbers they eventually admitted it was broken and reported within warranty and replaced it, but I wished I’d’ve got it from Costco so I could just return it there instead. 

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.

Another vote for Blueair. I’ve had a 411 and two smaller ones running continuously for a few years now and they help with dust, dander, and lessening mildew. The app is pretty cool. The soft white noise is perfect for sleeping. Plus I run HVAC filtration every hour.

Unfortunatly, i had at Blueair 411 formabout 5 years in the bedroom. It just stopped working. So I replaced it with the newer 511

Ah, that's too bad. We've got a bunch of 411s and they're all still going strong. They're fairly simple, which is I suspect also why they're relatively reliable. I wonder if it's repairable honestly. Like maybe something just came loose inside there. I actually couldn't remember exactly when I bought all of ours so I looked it up in my Amazon history. We have three 411s that are all 8 years old now and still going. We have two 211+ models and they're 7 years old. And then 3 411 Autos that are now 3 years old. So far no problems with any of them running all day every day.

The only thing that will stop dust from your PC is you cleaning your PC and cleaning your house. Regularly. I have a 411 for over a year, and it's been fine. Edit for clarity

I have horrible sinuses. Over the years, I've used a bunch of different kinds of air purifiers. The ones that I've used for the past 8 or 9 years have been BlueAir. I've used their 211 and 411 models 24/7. They're both quiet, don't use a lot of energy, and have lasted with no problems over that time. The main reason that I like them is that they're easy to clean. A dirty air purifier doesn't do anybody any good. All high quality air purifiers have a pre-filter that collects the larger dust particles. The HEPA filter collects the microscopic stuff. To clean the pre-filter on most of them requires disassembling the unit and struggling with a mesh or fabric filter that's usually glued onto a plastic frame. It's not quick and it's not easy. The BlueAir models have what looks like an ornamental fabric cover on the lower part of the outside. That's actually the pre-filter. To clean it, you slide it off exactly the way that you slide off a sock, and then throw it in the wash. It goes back on the same way that you slide on a sock. It's a brilliant, extremely effective design.

I have TERRIBLE allergies. My nose drips continuously. I have 3 BlueAir 211 (2800 sqft townhome; Bedroom, living room, kitchen) and one 411 (by my cat’s litter box) When I’m at home, I experienced zero allergy symptoms. As soon as I get my car and drive out of my garage , my nose starts running. Can’t speak highly enough about the BlueAir 211. I have to replace the filters ($74 each) every 4–5 months. Worth every penny.

I also have always coveted the coway airmega, which has remained high in rankings (though can’t fully ‘trust’ any of them) but also above $200. How much are replacement filters? I bought my blueair 411 (not auto) 2019 for $100 and it remained high in all the rankings until 2022 when other stuff creeped up. My model remains less than $150 and Manufacturer’s replacement filters are $25 a piece but external prefilter cleaning by vacuuming and/or washing makes them last way longer. And they have prettier pre filters than the standard bright spandex ones that come w it. Does airmega have a ‘prefilter’?