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Old 11-26-2007, 10:15 PM   #1
Oct 2007
Boston, MA
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My ambient temperature of the room that I am currently fermenting an irish red ale in is about 69dF. However that little fermometer, or that strip thermometer on my bucket is reading 75dF! Can the metabolic activity of fermentation increase the beer 5d in comparison with the surroundings?? or is my strip thermometer faulty? I've adjusted the heat in the room hoping that the temp will cool because I don't want my beer fermenting at 75d. What do you guys think?
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Old 11-26-2007, 10:19 PM   #2
bradsul's Avatar
Sep 2006
Ontario, Canada
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Fermentation definitely generates a lot of heat! I have my son of fermentation chiller at 62F to get my 68F fermentation temperature.
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Old 11-26-2007, 10:37 PM   #3
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Feb 2006
Wrentham, MA
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My Basement sits at about 60 degrees in the late Fall. I just had my Primary during the first three days of Fermentation down their. It was at a constant 68 degrees due to the heat that Fermentation puts off. So yes, Fermentation will raise the temp of your Wort.
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Old 11-26-2007, 10:42 PM   #4
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May 2007
New Bern, NC
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You got it....once you pitch your yeast, keep it around 68 until you see activity, then drop it down to about 65F. You don't want to let the fermentation heat things so much that you start creating fusels/off flavors.

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Old 11-27-2007, 03:14 PM   #5
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Oct 2005
Oak Grove, Oregon, USA
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Heat of fermentation is 23.5 Kcal/mol for glucose. That's one degree C for a 23L batch PER 180g, about double that for a mol of maltose.

With Distiller's yeast, they warn you to never do ten gallon batches without active cooling.
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