Does anyone know how effective home filter purifiers are? I have been going to my office because of AC. I am about 20 feet from my partner. He keeps his door c

Does anyone know how effective home filter purifiers are? I have been going to my office because of AC. I am about 20 feet from my partner. He keeps his door closed I keep mine open. I bought two purifiers/filters one for each. they say HEPA but I have no idea if that's true. I keep mine running all the time even overnight. I'm young and healthy so likely risk is low but still being hot might be a worthy trade off. One commenter below says HEPA isn't even effective