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* Use an aquarium heater (Enheim brand recommended), fill a large plastic cooler with water and keep the water warm with the aquarium heater. Set the souring vessel in the cooler. See [https://www.homebrewersassociation.org/how-to-brew/homebrew-hacks-aquarium-heater-fermentation-controller/ this AHA article].
* Use a "Seedling Heat Mat" that is used to keep plants warm.
* 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. See this [https://www.facebook.com/groups/MilkTheFunk/permalink/2373341069360760/ MTF thread] for a Q&A on how to use an Anova for various brewing related methods as well as this [https://beerandbrewing.com/sous-vide-homebrewing/ Craft Beer and Brewing article by Art Whitaker].
* Similar to the Anova, James Spenser of [http://basicbrewing.com/ BasicBrewing.com] video on using an [https://www.youtube.com/watch?v=bquf6EhRe5Q InstantPot® to maintain "yogurt" temperatures for 1 gallon batches].
* 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].