25F - as said above, it requires liaison between pax/cabin crew and flight deck. Flight deck indications are two-fold, supply temperature and cabin air temperature.
MOST pax seem to 'feel' the supply temp more than the cabin temp, largely because a lot of them do not bother to turn off the overhead louvres if they feel cold air, depsite the fact that the cabin itself may be hot. It is always a 'juggling act' to get it right.
A full cabin nearly always needs a significant cold flow, and it is complicated if the cabin gets hot on turn-round as the system will then go nuts trying to cool the cabin at first.
I'm sure the Ryanair crew were trying!