Energy is used for heating a building by a heating system.
Each system is equipped with a control, a heat producer, a heat exchanger, and a heat distributor.
Buildings use a combination of production, exchange, and distribution of energy to regulate temperatures.
buildings use a combination of production, exchange, and distribution of energy to for what

  * energy usage
  * consumers
  * ventilation
  * views
  * survival
  * temperature
  * Quality of life
  * water