I keep a box of the thermal wraps on hand when incubating. I'm not sure if they would work, or how well they would work because knock on wood so far, I haven't had to try, but that is my back up plan. This spring I am going to experiment with them and see how warm it would keep an incubator after power is cut to it.
Glad to hear that you chicks are hatching!
Glad to hear that you chicks are hatching!