'Hot' in the Bible

When you see a south wind blowing, you say, "It's going to be hot,' and so it is.

and the hypocrisy of liars, whose consciences have been burned by a hot iron.

"I know your actions, that you are neither cold nor hot. I wish you were cold or hot.

Since you are lukewarm and neither hot nor cold, I am going to spit you out of my mouth.