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What happens when a hydrocarbon such as propane or butane is used in an A/C system? The performance of the A/C system is actually not hampered by the use of these gases, however, the safety of the user of the vehicle is. If there is a leak in any part of the A/C system or a front-end I heard a story about HC-12a / OZ-12, are they flammable refrigerants? And what is the full story? According to the EPA HC-12a and OZ-12 brand hydrocarbon refrigerant blends are flammable refrigerants.  Their primary components are hydrocarbons, which are flammable substances like propane and I heard of propane or butane being used in A/C systems, is this true? Yes . There have been some documented cases where technicians have found 100% hydrocarbons in an A/C system. In this situation, it is acceptable to vent this gas –recovering this would cause too much Does the EPA test alternative refrigerants for performance in cars? No. The SNAP program evaluates substitutes only for their effect on human health and the environment, and not for performance or durability. None of the alternative refrigerants have been endorsed by Air Conditioning Frequently Asked Questions Air Conditioning FAQ A/C Systems and Service Refrigerants Contamination EPA A/C Organizations A/C Systems and Service What is an air purge system? An air-purge Air Conditioning Frequently Asked Questions "The Full Story" Air Conditioning FAQ A/C Systems and Service Refrigerants Contamination EPA A/C Organizations A/C Systems and Service What is an air purge system? An air-purge