Maintain a temperature between 100°-102° with a still air incubator and 99-99.5 with a forced air … An incubator is merely an oven to keep eggs warm enough that they hatch. The temperature is usually a bit above ambient, snuggely warm but not hot and controlled at all times. You can use another chook if it is clucky… ( willing to sit on the eggs ) But it would be difficult not to use electricity because of the convenience in a modern world.
2020 how to incubate eggs without electricity