Is air conditioner gas flammable?

Fast read

Air conditioners employ refrigerants to absorb hot air and transform it into cool air. R-32, R-22, and R410a are the three most typical varieties.

R-22 is combustible when exposed to air or oxidising substances. However, R-32 is classified as very somewhat flammable. When mixed with air under pressure or subjected to strong ignition sources. R410a, which is usually not flammable, can become so.

Other refrigerants with varied flammability levels include. Carbon dioxide, ammonia, R-600a, R-290, and R-1270.

It is crucial to adhere to correct installation and safety precautions to avoid potential risks like fires, injuries to people, and property damage. When buying air conditioners or other energy-related products. Please ask for guidance from a local installer.

Is there flammable gas in my air conditioner? 

Air conditioner’ gas’ refers to the type of refrigerant the specific system uses. These refrigerants absorb hot air and convert it to cool air for your home. The three most common types are R-32, R-22 and R410a. But are these refrigerant gases flammable and do they pose any fire risk?


R-32 refrigerant is rated as slightly flammable. Furthermore, the significant component of this refrigerant is difluoromethane. This substance is highly flammable. If your air conditioner contains R-32, it’s pressurised within a cylinder to prevent it from leaking into the air. If the cylinder gets too hot, it can explode. However, this is a rare occasion overall, so the risk is negligible. 

man using air conditioner in home

The R-22 refrigerant

R-22 becomes combustible upon contact with air or other oxidising materials. This gas is 1810 times more potent than carbon dioxide. As long as the air conditioner unit contains R-22, there shouldn’t be any issues.


R-410A is rated as not flammable at atmospheric pressure and ambient temperatures. However, the refrigerant can become flammable when exposed to strong ignition sources or mixed with air under pressure. Just like R-22, there is no reason to worry as long as R-410A does not leak from your air conditioner and comes into contact with something that causes a chemical reaction.

air conditioner being being filled with flammable gas
When using refrigerants in your AC, leaks are the only major concern

Other refrigerants

While the three previously mentioned refrigerants are the most common refrigerants, there are other variants.

For example, carbon dioxide can be a refrigerant. It is non-flammable and only becomes toxic when in high concentrations. Because some of the other refrigerants can damage the Ozone layer, we predict Carbon Dioxide will become more popular as a refrigerant in the future. 

Ammonia can be a suitable refrigerant. However, it is rated dangerous for explosion and rarely used in air conditioners.

Other refrigerants include R-600a, R-290 and R-1270. These all include hydrocarbon, which is rated as flammable.

Potential hazards

These natural alternatives have distinct hazard characteristics from the routinely utilised HFCs. They range from severe toxicity to high flammability. Therefore, if an air conditioning repair person is converting or changing a flammable refrigerant system, they must recognise the associated risks and implement all safety considerations.

If this does not occur, such failures could result in fires, personal harm, and property damage. Therefore, additional safety measures are necessary for equipment and systems that use flammable refrigerants.

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