Temperature control to support our yeast is probable the most important thing we can provide for their health and our brewing process, but it is the most overlooked aspect of the process in every book on brewing I’ve read. It’s always recommended that the home brewer pick-up a “free” discarded refrigerator, as an after thought. Everything written is about Boiling, Grain Bills, IBU’s and Water.
Glass and Plastic Carboys are great, but we need a truly temperature controlled system to brew properly.