The predominant application for heating, ventilation and temperature control with KNX is in the area of room oriented temperature control or individual room temperature control. By detecting the actual temperature value and specifying a respective temperature setpoint with a control algorithm, the thermostat sends a control value to the actuator. This actuator controls a heating or cooling unit that changes the room temperature.

Air Conditioners could be controlled via smart switches, touch screens and via smartphones. Different timer applications could be implemented to save energy.  The control modes are ON/OFF control, Temperature control, Cooling/Heating, Fan speed control, Swing control etc.