The article discusses the global use of air conditioning systems and the refrigerants they use. Many countries moved away from R22 refrigerant early on, yet half of air conditioners globally still rely on it. Around 60% of air conditioners use hydrofluorocarbon (HFC) refrigerants, with potential replacements like R407C and R410A being considered. Japan and South Korea recommend R32, while India opts for R290 in some systems. The article also explores air conditioners that use HFC refrigerants like R407C and R410A. Additionally, the use of electroconvection and low-temperature nonequilibrium plasma for air sterilization is described, showcasing effective bactericidal treatment for various surfaces and cultures.