Other rooms in the zone receive heat based on the needs of the room with the control. If a space heater is used in the room where the control device is located, the space heater may warm that room to the point where no other rooms in the zone receive any heat. Another typical problem with zone control is differing sun exposures or heat loads in different rooms within the zone. For zone control to work properly, all rooms in the zone must have essentially the same need for heat at all times. If your room is too hot during the winter in a building with zone control, the room with the control device may be calling for heat even though your room doesn't need any.
Building control is the least expensive method to install, with the least degree of comfort control.
There are no individual control devices in rooms within the building. The entire building receives heat based on the outdoor air temperature. As it gets colder outdoors, the heating water circulating throughout the building automatically gets hotter. The device controlling the water temperature must be set to keep the coldest room, with the most windows, on the northwest corner of the building warm. That usually results in many other areas of the building overheating, especially those with an interior or southern exposure.