For the longest time I have just put my fermenters on the floor of my basement and let them go. Air temperature is about 68 F. I don’t know what the floor temp is. The beer was about mid to high 70s when pitching. I have had no issues with the results. However, I am concerned that I am fermenting my beer at the top of the recommended temperature range, and maybe above. I have always had healty ferments, which could be adding to the temperatures.
For my latest batch I decided to see if I could lower the temperature. I put a Fermometer strip on the side of the fermenter. Pitched a large starter of yeast at 74 F and put it into a large bucket. The batch is 6.5 gallons. Around the fermenter I poured cold water (the first water out of the tap was measured at 60 F, but could have been lower after running for a while. I poured about 8 gallons of this cold water into the bucket so that the fermenter is sitting in a bath of cold water which comes about half way up. Obvious fermentation was going by next morning, and over the space of 24 hours, fermentation was healthy and the fermenter temperature went down to 62 degrees. This is the 4th day and it is still at 62 degrees. There is about an 2 inches of karusen on the beer, and it is bubbling away nicely.
Yeast is 1056.
I am hoping I am going to get a nice clean beer. Not sure what improvement I am going to detect, but hope there is something obvious. However, I am now getting concerned that I might be fermenting at too low a temperature. Is it possible to ferment too low? It is not much extra effort to do this - is it worth the extra little step?
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