Planning for the worst.

[Pythonfriend]

Keep something that conducts heat well in the empty space to hold it in. Most people use water bottles. If the power goes out, it takes significantly longer for the water to lose the heat than the air around it.

Yes, i mean, thermal capacity is what you need, and water bottles have high thermal capacity. Also it helps if the incubator has really good insulation. with good insulation and high thermal capacity, if you lose power, the incubator will lose its temperature very slowly. good insulation also means high energy efficiency, which also helps if your backup energy is limited, like when you use batteries.