Last night my hotel room was a balmy 80 degrees inside.
After turning the air conditioning down to 50 with no result, I called the front desk. they came up to my evil lair and proceeded to tell me that sometimes you have to take the cover off the unit and open one of the valves.
OH!, I SEE!
Why said valve was not open in the first place, I’ll never know. And as a former mechanic, I’d like to think I have a good handle on mechanical stuff. Despite this, however, I should have gone further than just changing the thermostat.