Question: do ac units still use freon?
Answer: For decades, Freon, also known as HCFC-22 and R-22, was the main refrigerant chemical used in residential air conditioning units and heat pumps. To help protect the ozone layer, the EPA has mandated that the production of Freon be stopped by January 2020. ... Most newer AC units use a refrigerant called R410A, or Puron.