In 2023, Vidya Ganji and her team studied 392 healthy non-smokers (aged 18-45) in Hyderabad, India. They compared 196 people who used air conditioners for 6-8 hours a day for over 2 years to 196 people who didn’t. They used a survey to check for Sick Building Syndrome, which means feeling sick from being in a building, and tested lung health with a breathing machine.