“While travelling recently I saw one element of HVAC that’s finally being done right.  Here’s one of the hotel thermostats I had to use.  Note how siple it is.   You press the red up arrow to make it warmer, the blue down arrow to make it colder.  You can turn the fan off and on.  You can change it to Celsius if you are so inclined.  And you can turn it off altogether.  That’s it.  I love this thing in a hotel setting, where users will have no time or interest in becoming familiar with the interface and have no need to program it for temperature changes during the day and evening."