One place I took a class had an even better solution: The thermostat on
the wall was hooked to nothing. The real thermostat was in a locked
closet with a louvered door.
I gather that this is common, common enough the the thermostat on the
wall has a name -- placebo thermostat.
Then there was the senior person in the office who felt that her
seniority gave her the right to control the environment. Management
gave her the afternoon off with pay, explaining that the tin bangers
had to work above her work station and it wouldn't be safe for her to
remain at her desk. Next morning she came in to find a nice, new
diffuser directly above her work station, and a new thermostat within
easy reach of her chair. No explanation but everyone lived happily