Xiaomi - Mi 3C

I have a Xiaomi air purifier, and it's able to talk to HA locally over WiFI. The current mIOT integration supports a bunch of products locally. You will need to create a xiaomi iot account for initial setup.

https://www.amazon.com/Xiaomi-Purifiers-Efficiency-Intelligent-Purifier/dp/B08LH7XZ3H. This one but the amazon listing isn't available anymore. I think the new ones also support it. Also I believe have different devices available for different regions. I also have a Levoit purifier but that one requires a cloud connection to integration with HA, no local options afaik.

FYI HEPA filters are basically marketing BS in the consumer world. Very few filters with "HEPA" in their description are actually capable of meeting HEPA standards. $400 for a 200sqft capable air purifier is crazy. I have a Levoit core-300 for my 100sq ft room and it clears out my vape smoke in a matter of seconds. I believe its possible to get activated charcoal filters for this to help reduce odor, if not you can find activated charcoal sheets or packets to put inside the air path. There's a community supported HA integration for Levoit, but its reliant on the cloud service. You can flash the Core 300 with ESPHome though and have it work completely locally. I also have a Xiaomi Air Purifier 3C, it also relies on a community maintained integration with Xiaomi Miot but it can work locally too, I know cause I have it blocked from internet access and it works fine. There is also a way to flash ESPHome on these, but I haven't tried. I'm using that one in my living room which is somewhere around 800 - 900 sqft but its a double height living room so there's a tremendous amount of volume there. Side note, make sure you've looked at fixing other parts of your house before getting an air purifier. Make sure your AC ducts are clean, and the filter for your AC is working properly. Though don't put a high MERV filter in there unless your air handler is designed for it. You can actually filter more without putting extra stress on your air handler with thicker filters, but in my experience its rare to see units that can hold the thicker filters without modification. Also make sure your windows are sealed properly.

I have pretty bad allergies so every dust season (damn that sounds dystopian) they act up. I lived in a few condos and there’s a noticeable difference in symptoms with and without air purifiers. I currently have 2 and planning to get another 1, so I have 1 for each room. In some people’s eyes it may seem like a waste of money but in my eyes it’s an insurance for your health. I’d rather spend a few thousand baht if it means saving me from suffering decades down the line. Similarly, the risk and return or not wearing a helmet on a motorcycle is absolutely horrible. I don’t understand why people don’t wear them. For air purifiers I use Xiaomi. I have a 3C and a 4 Lite. The initial I’ve used for a I think 5 years and the latter I’ve had for abit more than a year both with no issues. Linked it here ->[Xiaomi Air purifiers on shopee](https://s.shopee.co.th/7AVh52hqaG) in case you wanna have a quick peek

I have a bunch of Xiaomi air purifiers (2, 2S, 3C, etc) one for each of my rooms and they work well. Tested with an IQAir and Qingping air quality meters. I would just get Xiaomi if they are more accessible / cheaper / have cheaper filters in your region

I got my new Xiaomi home to my condo and it’s reading under 5. Not really worth the money. So far.