So I have added temperature control to my fermentation, and just put my third batch in the chamber yesterday. First batch I set at 67F, but there was a 3 degree tolerance in either direction so the temp fluctuated between 64 and 70. I changed the parameters for the second batch to one degree, so temp fluctuated between 66 and 68. So, now that I have control I wonder about changing temperature during fermentation. The answer no doubt depends on what yeast I am using, but I interested to hear some thoughts on this.