Albert Barnes Commentary 2 Kings 20:2

"Then he turned his face to the wall, and prayed unto Jehovah, saying," — 2 Kings 20:2 (ASV)

He turned his face to the wall — This is in contrast to 1 Kings 21:4. Ahab turned his face in sullenness because he was too angry to speak, whereas Hezekiah turned his in devotion because he wished to pray undisturbed.