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updated tip on souring in a keg
* Use an [http://anovaculinary.com/ Anova sous vide device] - place the vessel in a larger vessel with water, and keep the heat applied to the outside water with the Anova. Works well for maintaining heat for starters too.
* Build an insulation box out of Styrofoam. See [https://www.facebook.com/groups/MilkTheFunk/permalink/1429055690455974/?comment_id=1429072997120910&comment_tracking=%7B%22tn%22%3A%22R9%22%7D this MTF post] and [https://www.facebook.com/groups/MilkTheFunk/permalink/1429055690455974/?comment_id=1429344713760405&comment_tracking=%7B%22tn%22%3A%22R4%22%7D this MTF post].
* Sour in a keg, and heat the keg. If the keg is not fitted with a [http://seanterrill.com/2015/06/25/build-a-better-spunding-valve/ spunding valve] or an airlock, be sure to burp the keg in case of an accidental yeast contamination as that would result in a lot of built up pressure. See [https://www.facebook.com/photo.php?fbid=10207497057613773&set=p.10207497057613773&type=3&permPage=1 this MTF post].
* If not using a plastic vessel, keep the vessel in an oven (if it fits) or an electric smoker.
* Use a [http://www.amazon.com/Zoo-Med-Reptile-Cable-14-75-Feet/dp/B001OVBEEK/ref=sr_1_1?ie=UTF8&qid=1460052384&sr=8-1&keywords=zoomed+reptile+heat+cable ZooMed Reptile Heater Cable] inside of a fermentation chamber. Line the inside of the chamber walls with the wire and secure with duct tape.