The double box has a mini oil heater and a radiant heat panel.. each tortoise also has a Kane mat. It’s all on thermostats.Other than electricity, how are you keeping your torts warm?
The single box had only the radiant heat panel and Kane mate.. I had to add a CHE when our blizzard hit..
Electricity luckily wasn’t a concern for me. We put in a back up generator run by a propane tank a few years back after losing power for many days.. every time the wind blows here, our power goes out.