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Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Fermentation temperatures
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Old 06-26-2012, 04:58 AM   #1
hulkavitch
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Default Fermentation temperatures

I have read posts that say fermentation temperatures are 8-10 degrees higher than ambient. With that having been said if you are using a johnson controller/chest freezer combo, the probe is attached to the fermenter, and you want to ferment at 62.

Do you set the controller to 62 or 52?

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Old 06-26-2012, 05:12 AM   #2
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8-10 seems a little too high. It could get that much higher than ambient, but probably only for a very active fermentation. One problem with setting to an adjusted ambient is that the heat generated by the yeast varies with time. Adjusting for the heat generation might be better than not doing it at all. But you would be better off using a thermowell or taping your thermocouple to your fermenter and setting to the intended temp. But if you don't want to do that, then yes, set temp to intended temp minus the heat you expect to be generated during fermentation. You could also initially set to the intended temp and once fermentation starts trim the temp back a few degrees.

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Old 06-26-2012, 05:14 AM   #3
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asked a similar question recently. im thinkin you are gonna want to be around 52-54, for the initail fermentation and raise the temp a deg or two till you hit ideal wort fermentation temps.

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Old 06-26-2012, 06:13 AM   #4
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Will taping the probe to the fermenter give acurate ferm temperatures? I thought it would be closer to ambient.

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Old 06-26-2012, 07:31 AM   #5
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Quote:
Originally Posted by hulkavitch
Will taping the probe to the fermenter give acurate ferm temperatures? I thought it would be closer to ambient.
You should tape the probe to the fermenter with some paper towels or napkins in between the tape and the probe. This will insulate the probe and the temp in the fermenter.

The temp should be closer to the fermentation vessel rather than the ambient temp.

Also, i'm now using mostly stainless for my fermenters and makes the temp transfer a little better than glass or plastic.
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Old 06-26-2012, 07:33 AM   #6
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Oh, and if I want to ferment at 62 after this insulation, I set it to 62.

If you're really concerned, get a thermowell

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Old 06-26-2012, 12:39 PM   #7
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In my experience, the difference between ambient and ferm temp depends on the yeast. I mostly use US-05, and in that case it's only been a few degrees higher than ambient, but I've used S-04 and it was ridiculously higher, more like 8 degrees up!

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Old 06-26-2012, 03:45 PM   #8
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Depends on the brew but for most I find I get 3-4 degrees above ambient when the temp is low. If the temp is higher then I see as much as 10 degrees over ambient.

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Old 06-26-2012, 05:00 PM   #9
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I saved some bubble wrap. I tape the probe to the plastic fermenter and then tape a couple layers of bubble wrap over the top for insulation. The liquid crystal thermometer on the bucket matches the probe reading very closely. "Ambient" air temps in the freezer are all over the place.

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Old 06-26-2012, 05:30 PM   #10
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Quote:
Originally Posted by billl View Post
I saved some bubble wrap. I tape the probe to the plastic fermenter and then tape a couple layers of bubble wrap over the top for insulation. The liquid crystal thermometer on the bucket matches the probe reading very closely. "Ambient" air temps in the freezer are all over the place.
This. My Johnson readout and crystal fermometer are usually spot on, or within 1ºF at worst. I've used bubble wrap to insulate but now I just use a large handful of balled up plastic grocery bags.
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