Wall AC units, commonly known as window air conditioners, do require a refrigerant to operate, but they typically do not use Freon (also known as R-22) anymore. Freon is a type of hydrochlorofluorocarbon (HCFC) refrigerant that has been phased out due to its harmful impact on the environment, specifically its ozone-depleting properties.
Modern wall AC units now use different types of refrigerants, such as R-410A (Puron), which are more environmentally friendly and comply with current regulations. R-410A is a hydrofluorocarbon (HFC) refrigerant that does not contribute to ozone depletion.
It's important to note that only trained professionals should handle refrigerant-related tasks, including installation, maintenance, and recharging. If you have concerns or need assistance with your wall AC unit's refrigerant, it's best to contact a qualified technician or HVAC specialist to ensure safe and proper handling of the system.