The dome fans need to be functional. These did work at one time, but no longer seem to be operational.
They should run when the inside temperature is substantially different from the outside temperature.
When the dome opens at night, they should run for something like 2 minutes, to move the air from the dome.
Likewise, it would be good if they came on and ran whenever the CCD is on pause from taking images (like when the telescope is slewing to a new target), to refresh the air.