I stayed at the Dolphin last July, and I recall that my room was plenty cool with the air cranked up. I DID keep the curtains partially closed, however, while I was out of the room during the day.
I upped the a/c to high as we left the room...(anticipating a cool room upon our return)...the room was SO COLD-You could hang meat! LOL...The A/C works very well.