Quote:
Originally Posted by Slanter
What temperature are you trying to ferment at? Anything between 18-22 deg C is probably fine, assuming you're brewing with ale yeast. The yeast will generate quite a bit of heat themselves. Typically, homebrewers have trouble keeping the temperature low enough. Without temperature control, starting at room temperature, your fermentation might easily push up to 25 deg C. That tends to produce some off flavours, although it's usually not a big deal.
I'd really stay away from trying to heat it up though.
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Temperature control is the difference between decent beer and great beer.