No chiller. 180g with 14x 39w T-5's. Max temp is about 81-82 but I'm in S. Florida and my AC is set at 75 during the day and goes on and off most of the day.
I had an 8 bulb fixture over a 120g it got to hot it was a pain to keep the tank temp in the low 80's so instead of a chiller I got a dual 175w mh with vho actinics it was better but again your best bet is to get a light that wont make your water warm