I'm looking for some C02 sensors I can hook into Home Assistant and monitor background CO2 levels in various rooms.

 

Wifi/bluetooth or thread ok (I don't have Zigbee).

 

Want NDIR type sensor (for reasonable accuracy at sub 1000 levels). Either mains/USB powered or long battery live.  Does not need a screen but it is ok.

 

Some local supplies are in the $200~$400 range.  Some Aliexpress (eg Tuya type) in the $50~$100 range.  I prefer the latter if anyone has good experience to share?