« on: October 17, 2015, 02:31:50 PM »
The reason a swimming pool at 20 Celsius feels a hell of a lot colder than air at 20 Celsius is because the water conducts heat out of your body faster.
Exactly why the tub of water is effective at sinking excess heat from the fermenter. Look, not trying to be argumentative - if there's one theme on this forum, it's that there are multiple ways to make good beer. While more labor intensive than the zip up jacket, I'm just saying that this is a viable option for somebody on a budget (like I was when I started).