In the 13 countries participating in the IEA Energy Conservation in Buildings & Community Systems Program, the primary energy consumption attributable to the ventilation of all buildings is estimated to equal 9% of the total primary energy consumption of the countries.
An estimated 3 exajoule (EJ) of energy are used annually to ventilate US residential buildings, approximately 30% of the total energy used in these buildings. In the US service sector (e.g. commercial, institutional, and government buildings), the estimated energy consumed for ventilation is 1.5 EJ, approximately a quarter of total service-sector building energy use. The annual carbon dioxide emissions attributed to ventilation are approximately 1,000 and 800 million tons for the US residential and service sectors, respectively.
Climate has a large influence on the energy required to thermally condition ventilation air. In Europe, most of this energy is used for heating the ventilation air. In the US, significant energy is used both for heating and cooling. In the humid Miami climate, 86% of the energy is used to remove moisture from the ventilation air.*
*Seppanen, O (2002). "Ventilation, Energy and Indoor Air Quality".