Our expert says:
There isn't any gas used in aircon systems other than ordinary air that is cooled. As long as your air conditioning unit works properly and is regularly serviced, then the health risks are slight. People who live and work in buildings using natural ventilation do tend to report fewer symptoms - like headaches and dizziness - than those in air-conditioned buildings. But heat stress in very hot climates can cause such symptoms too, so you are almost definitely better off using the air con. It's good practice to turn it off or set it lower at cooler times though - don't get too dependent on it.
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