HEPAClean Compact Air Purifier HHT-011

I'm using old Honeywell HHT-011 air purifiers. You can find them for as little as 20 bucks and the filters are relatively cheap. At some point I may modify them with esp32home so I can control the fan speed but this works well enough for me for now. I also use presence detection to determine if they should be on or not. In my office, it's OK when I'm present but in the living room, if people are present and the TV is on, it turns off.

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

Honeywell. Their HEPA air purifiers routinely test out as the most effective and they make units made for spaces that large (I have one, it's such a relief during wildfire season). They aren't the quietist or the prettiest, but they don't need to be because they work. If you'll allow me on my soap box just a sec, please don't spend your money on popular "technologies" like ozone, static electricity, magnetized, etc. They don't work. What works is certified HEPA filters, H13 or H14.

For reasonable VOC removal there are only 4 players I know in the market which offer products which have the minimum 10 pounds of sorbent media: Airpura, Allerair, Austin, IQAir. Wildfires product a huge mix of chemicals - from the vegetation, contents of burned buildings, etc. There is no consumer solution that removes all VOCs. Each type of media is better at some chemicals, not so good or not effective at all with others. For the same reason there is no sensor that I know that will give you the level of all VOCs. These machines and filters tend to be expensive. I just upgraded my Austin units with Immunity Machine filters which cost \~$700 each. We were spared wildfire smoke this season but with AQI numbers breaking 100 I was able to keep my indoor values close to 0. I use Austin and IQAir VOC machines along with Honeywell and Whirlpool HEPA units, 3 filters per room.

Honeywell HEPA air purifiers. I have two: one in bedroom and one in the room where I spend most of my time watching TV, etc. Makes a difference for me.

I have these, as well, and they’re great. The cheap after-market filters from Amazon work perfectly for them, too.

They aren't trendy or cool, but we've had a good experience with the honeywell HEPA air purifiers. They have different options from $80 up to $250 depending on size and features.