I've just finished building a water-based fermentation chamber that pumps chilled water around my carboy, but I'm concerned about how cold the water around the carboy will be.
The water pump that pumps chilled water around the carboy is plugged into a thermostat whose temperature probe is covered by insulation and taped to the side of the carboy. Depending on the initial temperature of the carboy, I'm afraid that the pump will fill the fermentation chamber with cold water, potentially overshoot the chilling temperature, and shock the yeast. Would setting a higher temperature differential on my thermostat for the first few hours prevent the pump from overchilling while the wort temperature and surrounding water temperature equalize?
I assume regular fermentation chambers face this problem since the the wort will be around 70F initially and the refrigerator will be pushing in 40F until the wort temperature hits the desired target.
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