InSight HEPA Air Purifier HPA5100 Series

I've only used one. My son bought me a Honeywell HPA 5100B a couple of years ago. It's got a HEPA filter (change every 12th months), a prefilter (3 months), and optional odor and VOC filter (3 months). I use the first two. It's amazing how much visible crud is on the prefilters when they're pulled off. Crud isn't visible on the HEPA filter, but I'm breathing so I guess it's working. I don't have pets or other odor situation, so I don't use that filter.

Im doing good with Honeywell insight (largest size up to 500 sf). The filters arent cheap to replace but are HEPA & widely available. The only thing I don t like is you cant open it up to clean the vents.

They're not the quietest* of all available options nor the cheapest but every one of my Honeywell devices has worked very well with daily use for 5+ years. I bought them on sale, watch for filter sales online (I buy the Honeywell brand as I haven't found good testing data for knock offs) and I have no regrets. Models I use: Honeywell Insight in Medium-Large (x2) and Large-Extra Large (x1). * They do run quietly on lower settings but I generally use the higher two settings.

Mine is a Honeywell. Because I know I'll be able to continue to get filters (even if I do buy off brand ones, bc theirs are SO expensive). Standard filters is the way. The A+ prefilter is better than the standard softer A style, but both are good at catching cat hair (I vacuum it off regularly)

Honeywell makes standard styles/sizes (mine uses two R filters) and other companies use the same system so it's easy. You can also search by model number (ex hpa 200) These are what I bought last time: https://ebay.io/m/JRqZjg

Yes. I have Honeywell HEPA units in multiple houses. 24/7.