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How to heat/ control temperature for glass carboy

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Colizza

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Joined
Jul 1, 2014
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Hey, i'm looking on experimenting with fermentation temperatures and the developement of yeast esters and i would need something to warm my carboy. I heard of heating belts but some told me the break easily. So any ideas on controlling fermentation temperature as precisely as possible?
 
I have a 12-gallon rope-handled tub that I put my 6.5-gallon carboy in, then I fill the tub up with enough water to get me up to the level of the wort in the fermenter. I then pop an aquarium thermostat (http://www.amazon.com/dp/B003U82YEY/?tag=skimlinks_replacement-20) on the side of the carboy and set the temp.

This setup works really well to keep a temp that's higher than ambient, but cooling is a tougher proposition. I'm lucky to have a basement that stays 58-65F year-round, so this setup should work really well for ales. I cold crash by putting multiple frozen water bottles into the tub and replacing them every 8-12 hours.
 
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Can you control the temperature well (per say i want to raise the wort temperature by 1 degree/day) and can it warm up to the high 70s?
 
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