AC4100

I have one of these in each of my bedrooms. They are inexpensive, though kind of loud. They work great as a sound machine at night. Honestly, I'm not entirely sure of their overall effectiveness...or that of any air purifier. Sometimes I think they're just a sales pitch for money. I notice a much bigger difference in dust and odors when I stay on top of vacuuming and other cleaning. Since they have a physical on/off switch, I connected each to a Zigbee plug and integrated into Home Assistant. GermGuardian Air Purifier for Home with HEPA Filter, Removes 99.97% of Pollutants, Covers up to 375 Sq. Foot Room in 1 Hr, UV-C Light Helps Reduce Germs, Zero Ozone Verified, 11", Silver, AC4100CA https://a.co/d/gnGXI0n

I have a GermGuardian setup to blow right after my boxes. It’s the ~tabletop-sized one (that requires E filters). I have it on top of a low-height wooden box for shoe storage. So it’s ~18-28” above the ground. That seems to do wonders I also have a PetFusion privacy gate that blocks the area around cat boxes. It’s made of wood frames and semi-opaque plastic in the middle of the 3 panels. It’s maybe 3-4’ high. I think it does a good job of keeping in the litter and the smells The air purifier blows over cat boxes and is kind of corralled in the litter area, thanks to the walls and this cat privacy screen

For less than that I got two germ guardian hepa air filters, and a Bissell hepa vacuum.

It's kind of hard to tell for sure since you get used to the smell of your own house. I will say people have told me they are surprised they don't notice animal smells in my house, except when they are right next to the animals themselves though. So I think I am doing something right. Both brands I mentioned come with charcoal prefilters which absorb odors. The Winex especially comes with like 4 charcoal prefilters per each paper filter, and I find I don't even go through all 4. Another good option for odors is Purifan, which is a ceiling fan airfilter. They work REALLY well for smoke and odors, but not at all for pet hair really. I have a 4000 square foot home with three Winex, two Coways, one Purifan and one Shark air filter. I used to have a couple of GermGuardians too, but they are kinda loud relative to how little air they actually move. Nothing though is going to beat regularly bathing your pets and regularly vacuuming areas.

Germguardian, not sure about for life. But they warrantied one free of charge, paid for return shipping and all. Filters aren’t crazy, and you can see the work they do. I have no measurements for it, but I like em. They all are essentially just motors and fins.