I was under the impression that most of the digital air con units reset themselves. This is on purpose so when someone checks out and they set the unit to -30 degrees that when the next person checks it, it is not like a freezer in the room. Same goes for those who like it hot.
I'd very much doubt that the cleaners reset the thermostat in each and every room they visit. Seems pointless??

Probably wrong, but there you go.