Refrigerant, also known as Freon, is a chemical that helps cool and dehumidify air. It is used in air conditioners, refrigerators, and freezers. When it leaks, it can cause serious harm to the environment. The U.S. Environmental Protection Agency (EPA) regulates the use of refrigerants to help protect the ozone layer. Refrigerants do not last forever. They eventually leak out of the system where they are used. A small amount of leakage is normal and is not harmful to the environment. However, large leaks can be damaging. To help prevent large leaks, it is important to keep your air conditioner, refrigerator, or freezer well-maintained.