Where do you buy freon for central air conditioner?

You cannot buy Freon for a central air conditioner. Freon is a brand name for a specific type of refrigerant, and its production has been banned in the United States since 1995 due to its ozone-depleting properties. Alternative refrigerants, such as R-22 and R-410A, are now used in central air conditioners, but they must be purchased by qualified technicians who are licensed to handle refrigerants. You can find a list of licensed refrigerant technicians in your area by contacting the Environmental Protection Agency (EPA) or your local air conditioning repair company.