AC Refrigerant Types: R32, R410A, R22 Explained

The refrigerant is the working fluid that makes an AC function. It absorbs heat inside your room and releases it outside in a continuous cycle. The type of refrigerant in your AC determines its environmental footprint, what happens if it leaks, how it must be serviced, and whether you can get it topped up or repaired in years to come. Understanding the three most common types helps you make a better buying decision and know what to ask when your unit needs servicing.

The Three Main Refrigerants

R22 (Chlorodifluoromethane / Freon)

R22 was the dominant residential AC refrigerant for decades. It is a hydrochlorofluorocarbon (HCFC) that depletes the ozone layer when released into the atmosphere. Under the Montreal Protocol, production and import of R22 has been progressively restricted worldwide. India phased out R22 production for new equipment in 2025. The refrigerant itself is not yet illegal to use in existing equipment, but it is increasingly scarce and expensive.

If you have a unit manufactured before approximately 2010 to 2012 that needs a refrigerant top-up, the technician will likely tell you R22 is difficult to source. This is accurate. Options for R22 units that develop leaks:

• Locate the leak, repair it, and recharge with remaining R22 stock (increasingly expensive).
• Convert the unit to a drop-in R22 substitute refrigerant (not available for all units; reduces efficiency).
• Replace the unit with a current R32 or R410A model. Often the most practical choice for units over 10 years old.

R410A (Puron)

R410A replaced R22 as the standard residential refrigerant through the 2000s and 2010s in most markets. It does not deplete the ozone layer but has a very high global warming potential (GWP) of 2,088, meaning one kilogram released is equivalent to 2,088 kilograms of CO2 in terms of atmospheric warming over 100 years. Under the Kigali Amendment to the Montreal Protocol, R410A is now being phased down globally, with India committed to reductions beginning in 2028.

R410A operates at higher pressures than R22 or R32, which means R410A equipment requires thicker-walled refrigerant pipes and fittings. R32 and R410A are not interchangeable; a unit designed for R410A cannot be retrofitted with R32 without replacing major components.

Units manufactured between roughly 2010 and 2020 in India and many other markets are likely to contain R410A. Servicing these units is currently straightforward as R410A is widely available, though the regulatory trajectory means availability and cost will change over the next decade.

R32 (Difluoromethane)

R32 is the current standard refrigerant for new residential ACs in India, Japan, China, and most of South-East and South Asia. It has a GWP of 675, which is about one-third of R410A. It does not deplete the ozone layer. R32 is also more efficient than R410A: it requires less refrigerant charge by weight for equivalent cooling capacity (approximately 20 to 30 percent less refrigerant per unit), which reduces the environmental impact of manufacturing and of any leaks.

R32 is mildly flammable (classified A2L under ASHRAE safety standards). This means the refrigerant can burn under specific conditions of concentration and ignition, which is why R32 units have minimum room size requirements for safe installation and technicians handling it must be qualified for A2L refrigerants. In normal residential use with a correctly installed unit, the flammability risk is negligible, but it is a real consideration for extremely small enclosed spaces and for technicians.

R290 (Propane)

R290 is a natural hydrocarbon refrigerant with a GWP of just 3. It is used in small commercial refrigeration, portable ACs, and a growing number of residential units designed for markets that prioritise environmental credentials. It is significantly more flammable than R32 (classified A3, highly flammable), which limits charge size and requires more stringent installation standards. Not yet common in Indian residential split ACs but worth knowing about as regulations continue to push toward lower-GWP options.

Side-by-Side Comparison

How to Find Out Which Refrigerant Your AC Uses

The refrigerant type is always printed on the specification label on the outdoor unit. Look for a label that reads "Refrigerant: R32" or "R410A" or similar. The same information appears in the user manual and on the product page of the manufacturer's website when you search for your model number.

Do not rely on the AC's age alone. While most post-2020 Indian ACs use R32 and most 2010 to 2020 units use R410A, individual brands made the transition at different times. Always check the label.

Why You Cannot Mix Refrigerants

Each refrigerant type operates at a specific pressure and has specific thermodynamic properties. Adding the wrong refrigerant to a system contaminates the refrigerant charge and can damage the compressor. A technician who tops up an R32 system with R410A, or vice versa, causes serious damage. Always confirm the refrigerant type before any service work on the refrigerant circuit.

Frequently Asked Questions

Sources and Further Reading

• United Nations Environment Programme, Kigali Amendment to the Montreal Protocol (ozone.unep.org)
• Bureau of Energy Efficiency, India refrigerant phase-out schedule (beeindia.gov.in)
• ASHRAE, refrigerant safety classification standard 34 (ashrae.org)