Since these days a can of R134a is about $15, the cost differential isn’t what it was in the panicked days of the mid-1990s.It’s often said that buying or selling R12 is illegal. It has many uses and is known even by individuals outside of the HVAC profession. Examples include R-12, often used in refrigerators, and R-22 (also called HCFC-22), used in home air conditioning units. Examples include R-12, often used in refrigerators, and R-22 (also called HCFC-22), used in home air conditioning units. If it says R-22 or HCFC-22, then you know you have Freon. Refrigerant contains chemicals called fluorinated hydrocarbons (often referred to by a common brand name, “Freon”). In addition to fluorine and carbon, Freons often contain hydrogen, chlorine, or bromine. “Freon” is simply a brand name owned by DuPont chemicals. Freon is the common name for HCFC-22 and R-22. The term "freon" is a common descriptor or proprietary eponym (similar to a generic trademark) like "xerox" , "frosted flakes" or "kleenex". Over the years, the name has become synonymous with refrigerant, as has happened with Kleenex and tissue. But it’s used as a generic term for any air conditioning coolant. Usually propane. Usually a gas at room temperature. In such systems, a mixture of chemicals known as a refrigerant is contained in liquid form under pressure, and when that mixture is pumped into a region of lower pressure, it expands and changes phase into a gas, absorbing nearby heat before being pumped to a different location. We'll take it from there. What is Freon Used for in AC Units? Refrigerant R-11 is another refrigerant used commonly in the refrigeration and air conditioning systems. Freon freon is a refrigerant gas mainly used in home air conditioning system rather than pump money an... 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