'Cool' in the Bible

Then Ehud approached him while he was sitting alone in his room upstairs where it was cool. Ehud said, “I have a word from God for you,” and the king stood up from his throne.

Then Ehud left the cool chamber in the direction of the vestibule, shutting and locking the doors behind him.

Ehud was gone when Eglon’s servants came in. They looked and found the doors of the upstairs room locked and thought he was relieving himself in the cool room.