Another important setting on the Amana PTAC that I discovered last week when I set my thermostat to 60 but the room barely approached comfortable is setting C8 "Cooling Temperature Limiting". It was set to 72. Even though the buttons would take it down to 60, it maxxed (minned?) out at 72. Changing this to 60 fixed this problem.

Should make it known that, for you warmth lovers, there is a heating temperature limiting, setting C9.