Thermostat Coupler is a device used to control the operation of one or more thermostats, allowing multiple devices to be connected to the same system. This device typically consists of two parts; an electrical coupler that connects the wiring between the thermostats, and a mechanical coupler that interconnects the different mechanisms involved in temperature adjustment. By providing a single interface for controlling multiple thermostats, Thermostat Couplers help to simplify complex systems and reduce costly installation time.