You are presented with the quiz "buildings use a combination of production, exchange, and distribution of energy to for what" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "energy is used for heating a building by a heating system" and "each system is equipped with a control, a heat producer, a heat exchanger, and a heat distributor". 

So, what's the best answer to the question?


 

      temperature     