One way or the other, moisture will find it's way into a camera.
You can open the chamber and let it dry out, then close it again with some hot air blowing on it from a hairdrier.
The biggest problem with doing it this way is dust
Another way of doing it is placing the whole opened camera in a zippy bag with some silica bags and wait a couple of hours.
Then with the camera still in the bag, reassemble it.
I use the hot air method because it is quick and works for me everytime.
PS: You could also fire up the heater a while before powering the camera (if it has it's own power).
I own a QHY9 and the heater board is directly on top of the ccd chamber glass.