I have experienced this before with emydid eggs. I shut the door to the room in which my incubator stays, and left it closed all day accidentally. I have mercury vapor lights in there, and the room also gets sun exposure for most of the day. The room temperature rose above the incubator temperature (over 90). It was a very short period of time, and I had roughly the same hatch rates as previous years. Don't give up hope! I've heard of horror stories before, and it seems that the eggs will start to mold within just a few days. I hope it all works out for you.