I hate hot cabins in aircraft, because I just can't sleep when it's too hot. People can simply wear an added layer of clothing or use a blanket if it'S too cold for them, but there is no defense against a warm cabin...
Had some trouble with BR and TG, but never ever with TK.

I did about 10 longhaul C flights (IAH, MIA, CPT, BKK, SIN), 10 medium range (3 hours) in C (FRA, DUS, OSL), 4 medium range in Y (FRA, DUS) and 6 short hauls in Y with them during the last 3 years, and never ever has it been too warm. 777 or airbus, it was always nice and on the colder side. not freezing cold, but just the way I like it (I am a German used to cold weather and scuba diving in 11 degree clesius water with a wetsuit). I even use the blanket most of the time.