[F_r_k]

You can easily calibrate co2 , 02 and n2 sensors by going outside in a "wild/nature" place

[polskibus]

Depends on the sensor, also full auto mode usually means (for example MH-Z19) that it recalibrates every X hours, which means you'd have to go to the woods fairly often ;)

[gsich]

can be disabled. But then I'd recalibrate them after a few months. (I do it after 6 months usually)

[polskibus]

Which sensors do you use? Are you happy with them overall?

[gsich]

MH-Z14 and MH-Z19.

Yes, for the price absolutely.

[polskibus]

Are you using hass.io? Its plugin for MH-Z does not support switching auto calibration off, and in not sure how to do it.

[gsich]

No.