HEPA filters are entirely effective.
If you have ever tried a HEPA filter I would highly suggest that you try one.
If you are having any kind of indoor air quality issues at all then these are the best kind of filter so you can try. They are excellent for your indoor air quality. I guarantee you that they will work to give you better indoor air. For me I keep my home entirely clean plus dust free so I do not have too various issues with indoor air quality, at least not from the inside of my home. Most of my indoor air quality issues come from the outside. Unluckyly I live in a Dusty desert environment plus no matter how hard I try it it typically seems like I managed to get sand plus dirt in my house. This is where the indoor air filter comes in. The HEPA filter that I have installed on my heating, ventilation, plus A/C component does an excellent job of getting rid of that dirt plus debris. I did not typically know that I should use a HEPA filter though, in fact for the longest time I was entirely clueless on how to take respected care of my heating, ventilation, plus A/C unit. The only way that I learned plus found out was through some experimentation as well as asking the heating, ventilation, plus A/C workers lots of questions. Luckily I had various Heating as well as A/C workers who were kind plus willing to answer all my questions