It has been reported that many thermostats in office buildings are non-functional dummy devices, installed to give tenants' employees an illusion of control. These dummy thermostats are in effect a type of placebo button. However, these thermostats are often fully functional in the sense that they are used to detect the temperature in the zone, even though their controls are disabled and not used in lieu of the environmental controls of the building. This function is often referred to as "lockout".
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