I have them in the basement bathroom and the temp in there has been a steady 62* the whole time. That's the reason I have the incubator down there. It is a small room pretty separate from the rest of the house and I was able to limit traffic to just checking on the bator. I thought of that too, so I checked right away... Still 62*... Must be the chicks generating heat... Thankfully, I'm home almost all weekend. I can keep a close eye on it.102.4 in a still air incubator most likely won't kill them. The temperatures probably increased because the chicks are creating larger amounts of body heat as they develop. I usually have to turn mine down a bit later in incubation because of this, but I don't know why yours would spike that high unless the room temperature increased.