If you have a fan you can have it blowing on the wet towels that you wrapped around your fermenters. This will give you about 10˚F of evaporative cooling. The key is to keep the towels moist at all times. I do this by placing my fermenter in a container with some water in it, and have ends of the towels sitting in the water. The water will wick up into the towel, keeping it wet.
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Cheers,
John
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