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Old 07-08-2014, 05:26 PM   #1
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Default Temperature emergency

I brewed a hoppy blonde/wheat ale with an OG of 1.060. Using safale us-05

I pitch at 18C/64F and the fermenter usually don't go over 20-21C/68-70F during fermentation. This time, due to the unexpected warm summer weather, within 24 hours from start it was up to 22C/71.6F and now, 42 hours after start it is up at 24.5C/76F. I took a reading and it has fermented down to 1.030 already.
Is the beer possibly ruined?
Should I try to save it by putting it in a bathtub filled with cold water?

I also have two more batches in fermenters. A double IPA that started fermenting at least 48 hours before the warm weather kicked in (not taken any reading) and a hefeweizen that started fermenting a week before that. The hefeweizen has only gone from 1.014 to 1.011 during the heat period, can we assume the hefeweizen is ok at least? What about the double IPA (expensive batch)?

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Old 07-08-2014, 05:44 PM   #2
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Update: I took a reading on the double IPA and it has fermented from 1.082 down to 1.022 so far. Can't be sure how much of it happened it the first 48 hours while the temperature was around 20C/68F or the next 24 while it was still under 22C/71.5F...

Trying to save the hoppy wheat ale with cool water soaked towels. Doesn't seem to work that much. Bathtub?

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Old 07-08-2014, 05:45 PM   #3
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It is likely going to be okay. Most ester formation is in the beginning of the ferment, and while 76 is high, us-05 is a pretty clean and temperature tolerant yeast.

I wouldnt put it in a bathtub, as that may be too much of a temperature drop and shock the yeast from fully attenuating. Wrapping the carboys in wet towels and putting a small fan on them is probably sufficient.

The older beers will likely be fine.

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Old 07-08-2014, 05:51 PM   #4
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Put it in the bathtub with cold water. Cover about one-third of the fermentor with water. Don't want to drop the temperature to much to quickly. US05 ferments nice and clean at 68° to 70°.

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Old 07-08-2014, 05:51 PM   #5
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Also cooling with towels works slowly cause it works via evaporation. (plus active fermentation creates heat) Putting a fan on will help. Mostly that should get it to stabilize around 74, so it doesnt ramp up to 80.

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Old 07-08-2014, 06:46 PM   #6
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I tasted the samples I took on the two older batches. The hefeweizen seems fine. The double IPA I couldn't taste anything past the hop overdose, so I guess it is fine too, still gonna dry hop it.

I put the hoppy wheat fermenter in the bathtub, didn't fill it with water yet, just wrapped a lot of cold water soaked towels around it. Going to check the temperature again in a few hours.

Could it work if I slowly get it down to 70F/21C by gradually adding cold water to the bathtub?

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Old 07-08-2014, 07:12 PM   #7
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Theoretically. If the towels are submerged at the bottom in water, it will wick up. Dont panic.

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Old 07-08-2014, 09:28 PM   #8
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It has gradually decreased to 22C/71.5F.
The water is still relatively cold, maybe it could drop another degree or two by tomorrow without any furthern action on my part. Ambient temperature is around 24C but I know it will probably pick up to 26C mid day tomorrow.

We don't have any AC here because most of the year it's freezing cold. I could probably lager in my bedroom during winter time.
There's no way to get the temperature down, we don't even have fans.

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Old 07-08-2014, 09:30 PM   #9
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Bathtub cooling

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