
Coway
Airmega AP-1512HH Mighty
Durable, effective for allergens/odors, but loud on high.

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Try Shark HP302, personally using it since 2 months for parents and yes noticable impact is there
I got the Shark NeverChange Air Purifier MAX with Remote from Costco. The filter is good for 5 years and I have 2 cats, it has made a huge difference.
Mine is working fine. When I brought it home it read 90. Now I keep it on level 3 and its at 100. If I open a door for an extended time it goes down to 90. I know this is the official Shark hate sub, but mines OK. The only way the filter lasts 5 years is if you have it on auto, because it will never turn on lmao. Gotta keep it on manual mode. I expect to change the filter once a year.
Same thing happened to me, returned it and never looked back. Very common with this model. Shark wanted me to cut the cord and send out a new one but I am done, returned it.
I got a shark one from costco. It worked so well that I went back the next week and got another for the upstairs. the first is in my office with my rat cage.. the smell is virtually gone from them. The other is in my wife's library with the litter box for the cats. Smell is also gone.. Can't believe I didn't do this sooner.
I got shark neverchange last year on sale after doing a ton of research on if they actually help. I had been suffering with a stuffy nose at home for a few years after moving into an apartment that had poorly sealed windows and having a wildfire season that made the air really bad. After getting one, my stuffy nose has cleared up, and it's easier to breathe at home now. I dont think super cheap ones will work well, and you dont need to buy a really expensive one. But they are worth it and, in my opinion, really do help.
The version i have is the Neverchange Max. It does come with a scent packet with a dial to turn it up or down. I have that turned to medium most of the time as well and have not noticed any effect on my cat. It may be different for other cats with the scent. Good luck with the new fan!

Coway
Airmega AP-1512HH Mighty
Durable, effective for allergens/odors, but loud on high.

Levoit
Vital 200S-P
Smart, effective dust/odor; some find replacement filters pricey.

Winix
5500-2
Budget king, durable; poor VOC removal, Plasmawave disliked.

Coway
Airmega Mighty
Durable, great for allergies/dust, responsive auto-fan.

Winix
5510 & 5520
Good value, durable, effective for pets; carbon filter issues.

Ranked #1
IKEA - UPPÅTVIND

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CleanAirKits - Corsi-Rosenthal Box

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Austin Air - Healthmate Plus

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Winix - 5500-2

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Coway - Airmega 400

Ranked #1
Coway - Airmega AP-1512HH Mighty