That is correct. Virtually all cargo planes are pressurized. However, while the cargo area is almost invariably pressurized, they are often not heated. Some

That is correct. Virtually all cargo planes are pressurized. However, while the cargo area is almost invariably pressurized, they are often not heated. Some aircraft have designated cargo areas that are heated for transporting e.g. live animals. So if you end up in an unheated cargo area you won't die of asphyxiation, but could easily succumb to hypothermia or frostbite.