Dear Cynthia, I don't work for B.Carlson, been in refrigeration for 22 years, If your friend can find a supply house that will sell him a tank of R-22, I'll kiss his $@!#% in any intersection. Just Google it, R-22 is an old antiquated refrigerant and your friend is an idiot. If I was B.Carlson I'd tell you to take a hike and let your friend fix your AC !!!! Is your friend EPA compliant?? Bet not.