So, I'm sure people have used this before, but I haven't read about it. I was fermenting and the temp went up a couple degrees yesterday. It was at 72 in a 7 gallon glass carboy. I wanted it closer to 68. Easy solution? I took a towel, soaked it in water and wrapped it around the carboy. Then took a fan and put it on over the carboy overnight. Worked like a charm. Got up this morning and it was 66 degrees.
Has anybody else noticed that during primary fermentation the temp goes up a couple degrees? It the reaction exothermic?