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* Use a glass carboy FermWrap™ 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 an aquarium heater (Enheim band recommended), fill a large plastic cooler with water and keep the water warm with the aquarium heater. Set the souring vessel in the cooler.
* 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.
* If not using a plastic vessel, keep the vessel in an oven (if it fits) or an electric smoker.