Refrigerant gas runs through the coil and has an important role in cooling. Older air conditioners used R-22 which was a good alternative but excessively damaged the ozone levels. Its usage has been slowly discontinued and almost all air-conditioners mentioned in our list of the best air conditioners in India use R-32 refrigerant gas. It has almost a negligible impact on the environment and is more eco-friendly than R-22 or R410.