PlasmaPro 600S

I have this, and keep it on low, and it is way quieter than any of my winix purifiers. Only downside is that the prefilter is a pain in the ass because you would have to lift it out or shove a vacuum nozzle down into the base. So I barely clean the prefilter. 

I have a filter in every room, so I can't really quantify how well this one works. I just like that it is quiet.

FWIW you need to measure individual rooms and target the best or most frequent areas. The size of the house is somewhat irrelevant as these air purifiers work with smaller spaces. Additionally air purifiers are marketed very deceptively if you are not familiar with CADR or AC metrics. Some manufactures list square footage “up-to” a certain square footage. This is typically for 1 Air change rate an hour. For a decent filter in a room (that is used) you need at least 3 air changes for hour but the recommendation is 4.8 so I use 5 for my measurements. Will smaller air purifiers work? To some degree yes but they will take a very long time to clear out existing particulate matter from the air. So how does CADR fit in? It’s the actual measured rate at which clean air can be delivered by the unit. By knowing the CFM (cubic feet per minute) of the CADR (clean air delivery rate) you can size accordingly. budget constraints can definitely put pressure on your decision making but I would try to go with the larger most cost affordable option to get a better option. My suggestion would be the levoit Everest. Most places have it for $500 but for some reason BBY has them on clearance right now for $299. This single unit my provider more filtered air than the individual smaller units combined. I just added 2 more. Remember over sizing is ok but undersizing will take much longer to clear out existing particulate matter not accounting for new load. Additionally the Everest has wheels and can be easily moved. It is advertised as up to 2656 sq ft. This is for 1 air change. However we can see to hit the target 4.8 air changes to filter the air means this should really be used in a room no larger than 550 sq ft. If that doesn’t work in the budget focus on the smaller rooms for sure and size the air purifier accordingly. Otherwise you may feel like you wasted money and that air purifiers are not working. For what it’s worth I have shark never change (not great for large rooms but nice for bedrooms) the levoit plasma core 600 for our living room, the levoit Everest is in 4 bedrooms (price per performance while on clearance is hard to beat outside of DIY), a smart air blast mkII, and a 20x20 CR Cube with an 16” drum fan (garage) If you’re crafty a DIY Corsi Rosenthal cube can out perform every one of these for under $200 but the aesthetics are not very appeasing. (Hence why mine is in the garage) TLDR - sizing is important and advertising is not straightforward in regards to actual coverage.

We use Levoit and have been pleased with them, have 2 cats and a dog. We have larger ones in our Living Room and Primary Bedroom: https://a.co/d/79w3ipR In a few of our other rooms we have: https://a.co/d/bDoWsWi All in all probably overkill but we notice a significant difference on air quality and when it’s time to change/clean filters they are truly dirty so they are doing the trick. We didn’t buy them all at once mind you but slowly added them starting with the living room and primary bedroom.

I am a Levoit fan, I have the WiFi enabled purifiers throughout my home.

I use Levoit air purifiers in my home and pleased with them. A lot of their models are on sales on Amazon right now. I would suggest NOT leaving your window open if you’re concerned about allergens as well.

I bought 2, each of my adult children say theirs is the best, it’s a tie😉. https://www.bestbuy.com/product/blueair-blue-pure-211i-max-3000-sq-ft-hepasilent-smart-extra-large-room-air-purifier-white-gray/JX95HCYS4Z https://www.bestbuy.com/product/levoit-plasmapro-600s-p-smart-air-purifier-white/J3GTFSJJH9

I own two, my sons have them and highly recommended so I bought one of each. Levoit Plasma Pro 600SP Smart Air Purifier and the Blueair Blue Pure 211i Max 3000 square foot HEPA silent smart extra large room air purifier. Bought both at Best Buy. Awesome. Highly recommend both, not sure which is better, each of my sons swears by the one they purchased.

Way cheaper on Amazon. https://a.co/d/596A9LC I have 2 and I like them but the sensors in them are useless. They will only detect air quality in the immediate area of the purifier and mine always read 1. I just run mine on the 3rd speed all day and at bedtime I have it set to drop into quiet mode. It has made a decent difference in dust in the immediate area of the purifier.