HEPA filters are honestly effective. If you’ve ever tried a HEPA filter I would highly recommend that you try one. If you’re having any kind of indoor air quality problems 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 deliver you better indoor air. For me I keep my dwelling honestly clean plus dust free so I don’t have too more than 2 problems with indoor air quality, at least not from the inside of my home. Most of my indoor air quality problems come from the outside. Unfortunately I live in a Dusty desert environment plus no matter how taxing I try it it always 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 plus air conditioner does an excellent job of getting rid of that dirt plus debris. I did not always know that I should use a HEPA filter though, in fact for the longest time I was really clueless on how to take typical care of my heating plus air conditioner. The only way that I learned plus found out was through some experimentation & asking the heating & A/C workers lots of questions. Luckily I had more than 2 Heating plus A/C workers who were kind plus willing to answer all my questions