"Been kinda warm in the swamp lately. My ferment buckets are in the garage where the day time temp is getting over 100 degrees. My yield lately hasn't been anything to brag about so I'm thinkin' 100 or above ain't too good for the yeasties. I guess I'll have to move them inside where it's a little cooler but I was wondering at what temp they're the happiest.

Thanks"

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With a beer wash I use a fermenter chiller so the wash is held at 68F but with likker wash and distillers yeast I'll hold it around 78-80F. In beer the yeast has some result on the finished flavor but in likker its just a matter of keeping the yeast happy so it'll produce ethanol. Try it and see if it works for you."

If you have a dark NE corner of the house...and some Air Conditioning nearby...you might try on the floor in that room. A basement helps if you have one. In beer brewing, I find that adding yeast into your liquid is parallel to the temperature you will keep in your fermentation area. In other words if your room is approximately 75 degrees, try to pitch your yeast into your fermentation liquid at 75 degrees. Most yeast for distilling will need about 75 degrees to prosper. The yeastie beasties will die at 85 and they do generate temperature as they convert sugar to CO2 and that other stuff called alcohol. If you are without AC, try making a 12 to 16 inch depth of cold water in the bathtub and a frozen milk jug of water added once per day...still having trouble??? Add a wet towel wrapped around your fermenter for evaporative cooling...let me know if any of this helps you, it has all worked for me. In beer (and in my opinion), the "cold side" or yeast-fermentation side is the MOST important for good products.