Isolate and control individual radiators with a radiator valve. The most simplistic form is a manual radiator valve, but a popular choice is a thermostatic radiator valve. These valves are equipped with wax sensors which automatically control water flow through to a radiator based on the temperature of a room.
The occupant of the room can easily adjust thermostatic heads without affecting the rest of the system. Schools and hospitals can benefit from using a lockable thermostatic head that can only be adjusted by staff. Electronic actuator heads and timers can also be used to maximise system efficiency.