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* Use a glass carboy FermWrap™ heater or another carboy heater attached to a sensor thermowell through the cap and a temperature controller.
* Use a Brew Belt Fermentation Heating Belt and wrap a "hoody" sweater or some other fabric around it to insulate, and a temperature controller.
* Use a Kenley Fermentation Carboy Heater which comes with a thermostat (also marketed as a "Kombucha Heating kit").
* 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.