Nyuk Hien Wong N.H., Huang B.
Bibliographic info:
Building and Environment , Vol. 39, Issue 9, September 2004, pp 1115-1123

For that study, IAQ measurements were carried out in 3 residential Singapore dwellings. CO2 levels were higher in air-conditioned bedrooms than in naturally ventilated bedrooms. Another survey demonstrated that almost all occupants using air-conditioners while sleeping presented one or more SBS symptoms than when using natural ventilation.