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KNX is green

Reduced Energy consumption by using home and building control systems

Studies revealed by the KNX Association show how networked home and building control based on KNX allows up to 50% energy savings.   

Climate change and ever-depleting resources mean that efficient energy use is a key social issue. As they account for 40% of total energy consumption, buildings represent considerable energy saving potential. KNX meets the requirements of the top Energy Performance Class for building automation meaning it is ideally suited to fulfilling the tighter energy consumption requirements for buildings. Through intelligent control of building system technology with KNX, the energy consumption of a building can be halved.    

Intelligent control of building systems reduces energy consumption and the associated operating costs many times over - this is the conclusion reached by the   Institute for Building and Energy Systems at Biberach University of Applied Sciences , Germany. This follows extensive research into the potential energy savings that can be achieved using modern electrical installation systems such as KNX.

It sums up its results as follows: 

“Particularly automation functions, which present a high degree of energy-saving potential by combining various individual trades, can today only be achieved using modern building system technology based on bus and communication systems.”

Another research project, conducted at  Bremen University of Applied Sciences , Energy saving with KNX based on the shows the extent to which energy savings example of heating energy (source: can be achieved. The newly constructed Bremen University of Applied Sciences) Centre for Informatics and media Technologies (ZIMT) has been fitted with KNX controls and equipment for regulating heating and lighting. The data collected has been evaluated, and comparisons made between “normal” operation and “automation” mode. The building has a specific energy consumption of 60-75 kWh/m2a. Two identical classrooms were selected as test rooms. One was fitted with a conventional installation, and the second with KNX control.

Smart metering

Based on a four-year series of measurements, the use of KNX control was found to reduce energy consumption by an impressive 50%. It is thus clear that the expenditure in building automation system has quick payback. Bremen University of Applied Sciences calculated that, with an annual energy consumption of 230,000 kWh for lighting alone, the investment would pay itself back after just one year with a KNX bus control. Ultimately it is not just the owners/operators and investors who benefit from the reduced energy consumption: the climate does as well.


In summary, KNX allows the following energy savings to be made:

  • up to 40% with KNX shutter control
  • up to 50% with KNX single room control
  • up to 60% with KNX lighting control
  • up to 60% with KNX ventilation control

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