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Home Brew Forums > Home Brewing Beer > Brew Science > Fermintation temps.
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Old 05-08-2012, 12:04 AM   #1
flexfit115
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Default Fermintation temps.

It seems to me that every time I brew the thermometers on my bucket seem to say that my brew is 4 or so degrees higher than ambient temp in my house. Does fermentation cause temp to rise in the bucket or are the thermometers wrong? Or maybe I'm crazy?


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Old 05-08-2012, 12:09 AM   #2
JLem
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You're not crazy and the thermometers are not wrong (at least not relatively so). Fermentation is an exothermic process so you can expect your beer will be 5-10 degrees F higher than ambient.


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Old 05-08-2012, 12:15 AM   #3
flexfit115
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So do I try to cool it back to the proper temp per my yeast instructions, or is the calculated in the the yeast instructions?
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Old 05-08-2012, 12:18 AM   #4
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Relax. Don't worry. Have a homebrew...
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Old 05-08-2012, 01:05 AM   #5
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Quote:
Originally Posted by flexfit115 View Post
So do I try to cool it back to the proper temp per my yeast instructions, or is the calculated in the the yeast instructions?
Most of the time it is the fermentation temperature that is listed, so you should cool it down. For example, if I want a fermentation temp of 68°F, my ambient needs to be 60-62°F.

What are you making, what yeast are you using, and what is your ambient temp?
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Old 05-08-2012, 01:20 AM   #6
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That's what I thought, but brewing a Belgian Dubble, and wlp550 which is good up to 78 degrees according to their website. But I'm at about 77 degrees and ambient is 73 in my house. Thanks.
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Old 05-09-2012, 02:45 AM   #7
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It dropped right down to ambient temp after about 24 hrs. Thanks all!


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