 When God flooded the earth, he's in control of every other aspect of the physical world. I don't think that this heat issue is actually an issue at all. With natural laws, they act without contradiction, and I wanted to add that they tend to act in physics without exception. Are you suggesting maybe that the law of physics used to be different? Are you appealing to a miracle? If you're going to appeal to a scientific method, if you're going to appeal to laws of cause and effect, do those laws ever change over time? The only way that I can see that working is that he made it so it wasn't a problem until he changed it to look like it was. And that to me seems like it violates God's character. Your position is presupposing a particular situation where you're going to have this heat problem.