Hi,
If you have pack 1+2 fault you depressurize the cabin and you must descent 10000 ft. Then when the differential pressure is below 1psi (almost 0) you ventilate the cabin with the Ram Air, it is just air from outside at outside temperature but at least the passengers (and you) can breath.
the control of the cargo temperature is optional, on the right side of the overhead panel;
a type rating soon ?
good luck