Freon is not used up over time like oil or gas. Most car owners simply accept the fact that the Freon™ in their automobile’s air-conditioning system will have to be recharged periodically, as though this were an inevitability. Many drivers assume their air-conditioning system consumes coolant oil much as the engine uses fuel. Actually, a car’s air-conditioning system can run for years without recharging if properly maintained.
Freon is the brand name of a type of air-conditioning refrigerant gas manufactured by DuPont Chemicals. Other brands of R-22 refrigerant gas are made by other manufacturers. Over the years the chemical structure of these refrigerant gases like R-12 or R-14 have been replaced in general usage in response to environmental regulations by the United States Environmental Protection Agency.