Ryan, double-check your receipts from Priceline, and any literature for the hotel. If you stayed at the Hyatt Regency Monterey, (I didn't see anything on the Hyatt Regency site that mentioned any Hyatt Regency Pebble Bay, and Google doesn't know that name), there is nothing on the website for that hotel that says anything about air conditioning. It'd be one thing if your room had an a/c unit that wasn't working, but since the place isn't advertised as being air conditioned, there isn't really anything to ask a refund for. They didn't represent it as being air conditioned, at least not on the website.
So I think you're stuck on this one. But I'll wager in future you'll ask ahead, if it's important, right?
More to the point - did you enjoy the trip? It's a really cool area.
Dave