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.
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?
What percentage of energy in commercial buildings comes from HVAC systems ?
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