Many older air conditioners use R-22 refrigerant, but it is being phased out because it harms the ozone layer. R-22 contains chlorine, which contributes to ozone depletion, causing environmental and health problems. Switching to R-410A is necessary because it is more environmentally friendly and does not damage the ozone layer. Additionally, R-410A provides better cooling efficiency and system performance. This change aligns with global regulations to protect the environment. For more details about refrigerant phase-outs and alternatives, check this resource https://www.melaniejadedesign.com/refrigerant-changes/