Need advice on hepa air purifiers please

[BigButtons]

My children ( young adults) have developed bad allergic reactions to our three kittens. They had no issues with our old cat/
I am desperately looking at ways I can help with this.
none of us want to have to re home our much loved kitties.
i read about hepa purifiers and started investigating but am so confused.
my house isn’t large - small 3 bedroom- quite open plan.
I have read that the ones with pre filters are better as the main filter doesn’t need changing as often and that is quite a big cost consideration.
would be very grateful for any advice you can give- recommendations- things to watch out for etc
thanks🙂

Can’t comment on pre filters as I don’t know enough. But when I wanted an air purifier, I did a bit of research and muddled, emailed a uk company that seemed very reputable called SmartAir with questions. I wanted to know stuff about room coverage etc.. They were very helpful and i ended up buying from them. You could give them a try. And no I don’t work for SmartAir but am a huge cat fan :) Hope you can keep your kittens.