Hi,
Thanks for replying! I did see that comment actually. To test I also added a HTU21D temperature/humidity sensor to see if there are any huge differences. So far I haven’t noticed large temperature differences between the sensors however temperatures here haven’t dropped below 20 degrees and it might be a larger issue when temperatures are lower (?). Maybe something to investigate after the summer…
The CCS811 also has its own micro-controller on board which makes it easy to interface with (if you are not using ESPHome), you can even update its firmware. https://github.com/maarten-pennings/CCS811/tree/master/examples/ccs811flash
If you are interested in “air quality” and not raw CO2 readings you could also look at the BME680 sensor.