On 10 July, the CCR was 27.9 degrees C at midday, per a little digital travel thermometer I have (mainly for use on-board to show cabin crew if the cabin temperature is sauna like even if "set" at "21"). Manager person (I assume - they were wearing a suit as opposed to the Baxter Storey personnel) said they were having A/C issues. My polite comment was that in the last 3 years the CCR had always been overheated (a wholly subjective opinion) but today was particularly excessive. I find all of T5 to be overheated/under cooled (particularly the upper level) other than next to the big AC outlets mentioned upthread or domestic baggage reclaim next to the wall to the secure area (where the A/C outlets are).

ETA: It was a pleasant temperature on the intra T5 terminal train - surprisingly it was pleasantly cool, nice to get in it to ride to T5C.