On a beer that big, you wouldn't notice too much if it were fermented too warm, but you really should try to keep it cooler if you can.
In hot weather, I put my fermenter/s in the bathtub, put about 8 inches of water in the bottom and wrap bath towels around the fermenters. Then I put a fan near teh tub and turn it on low so it is constantly running an blowing a slow breeze across the fermenter/s. Each morning and evening, I ladle a bit of water onto the towels to keep them wet, but they do a pretty good job of wicking water out of the tub by themselves.
When it's REALLY warm out, I freeze a few 2 litre bottles of water and chuck them into the tub in the morning .
This method keeps my fermenters around 18°-21° C, which I consider a perfect fermenting temp for everythign except Lagers (which ferment in my lagerator)