I'm building my temperature controlled fermentation chamber (rubbermaid tub with a aquarium heater) and I was wondering . . if I put the primary into the tub and set the temp at 69F (This is a Wheat beer with a belgian yeast) will the temperature inside the fermenter (glass carboy) be the same as the temp of the water outside? I plan on filling the water on the outside up to about the 3 - 4 gallon mark of the carboy.
I ask because I want to keep my beers at a specific temperature! As close as possible at least, with the least amount of change.
I know a few of you out there currently use this method. . what say you?