I only use an humidifier when:

- my ball python is in shed and the humidity in the tank is too low to support a good shed
- my ball python is injured and needs additional humidity to support the healing

I do not use it on a regular basis, too much risk of issues in my opinion and further more if this needs to be used on a regular basis the tank is not set up properly for a ball python and then it is more recommended to get a stable setup.