One weekend, we went round with dummy control units (digital displays, backlit, looked the business, but not connected to anything) and blutacked them to the walls at various locations. Service desk complaints stopped immediately, everyone was happy.
In a similar vein I work in FM and run a large office. The temperature is supposed to be electronically controlled throughout the building to a constant but obviously fluctuates by a degree or so depending on other factors, equipment, no of staff in a given area, solar gain etc.
Anyway, we used to be inundated with complaints it was either too hot and too cold, often in the same area. After a while we just pretended to change the thermastat settings and then told staff. They always thanked us and noticed the difference so I presume it was just a placebo effect most of the time 🙂