In the United States, heating, ventilation and air conditioning (HVAC) systems account for 30% (4.65 EJ/yr) of the energy used in commercial buildings and nearly 50% (10.1 EJ/yr) of the energy used in residential buildings. Solar heating, cooling and ventilation technologies can be used to offset a portion of this energy.
What percentage of energy in commercial buildings comes from HVAC systems? How much energy does an HVAC system use in commercial locations? How much energy does an HVAC system use in residential locations? What can be used to balance out a portion of the energy used by HVAC systems?