R32, R410A, R22: which gas is in your AC, and why it matters

Updated September 1, 2026 · Claude AC · 3 sources cited

On the side of every outdoor unit there is a rating plate, and on it a line almost nobody reads before buying: Refrigerant: R32, followed by a charge weight in kilograms. That line quietly decides several things you will care about later — what a technician charges you the day the circuit leaks, how the machine must be worked on, whether the gas will still be easy to buy in 2038, and how comfortable you should feel about a fifteen-year-old unit in a rented flat.

Three refrigerants matter in Indian homes today. R22, the old one, still humming inside millions of machines bought before the switch. R410A, the transitional gas. R32, which now fills nearly everything sold new. They are not interchangeable, and the differences are worth ten minutes of attention before you commit to a machine you will keep for a decade.

The three gases, side by side

GWP is global warming potential: how much heat a kilogram of the gas traps compared with a kilogram of carbon dioxide over a century. It only becomes real when the gas escapes — which is exactly what happens at a bad flare joint, during a careless top-up, or when a scrapped machine is vented into the air behind a scrap dealer’s shop. A domestic split holds a modest charge, commonly under a kilogram and a half depending on model and pipe run, but at R410A’s GWP even that leak is the climate equivalent of a long car journey.

Why R32 replaced R410A

The switch was not marketing. Three technical differences drove it, and two of them affect your wallet directly.

• Single compound versus blend. R410A is two gases mixed by weight. When it leaks, the mixture can drift out of proportion, which is why correct practice on a leaking R410A system is to recover the remaining charge and recharge by weight rather than simply add more. R32 is a single compound: topping up is technically coherent. That difference shows up on the invoice, as our guide to gas refilling in India explains.
• Less gas for the same cooling. R32 carries more heat per unit of volume, so a machine of the same capacity is designed with a noticeably smaller charge — commonly a fifth to a third less refrigerant by weight. Less gas to buy, less gas to leak.
• A third of the climate cost. Around 675 against around 2,000 is the whole reason regulators pushed the industry across.

The trade-offs are real but manageable: R32 runs at a higher compressor discharge temperature, which is a design problem for the manufacturer rather than for you, and it is classified A2L — mildly flammable.

Does the refrigerant change your electricity bill?

Barely, on its own. Efficiency is a property of the whole machine — compressor, coil area, fan, control electronics — not of the gas in it. The number that predicts your bill is the ISEER printed on the BEE label, which is measured on the finished product whatever it contains; the arithmetic is in our guide to star ratings and ISEER.

So do not pay a premium for R32 expecting a star. Buy the star rating, and treat the refrigerant as a servicing and future-supply question. There is a correlation worth noticing, though: R32 machines are the newer designs, and newer designs — inverter models especially — are usually the more efficient ones.

Is R32 dangerous in a flat?

« Mildly flammable » sounds worse than it behaves. An A2L gas needs a fairly narrow concentration in air and a real ignition source to burn, and it does not propagate easily. Safety standards set a maximum charge relative to the floor area of the room served, and manufacturers already design domestic split capacities to sit inside those limits.

What genuinely changes is the technician’s practice: recover the charge properly instead of venting it, never braze on a circuit that still holds refrigerant, keep the space ventilated, and use a leak detector rated for the gas. The risk in an Indian flat is not the gas class; it is the informal technician who opens a sealed circuit without recovery equipment.

One rule has no exceptions: never put R32 into a system built for R410A or R22, and never mix. Operating pressures, compressor oil and flammability class all differ, the result is unreliable at best and unsafe at worst, and it ends any warranty argument you might have had.

The phase-out calendar, and why it is a purchase question

Two international agreements govern this, and they do different jobs.

The Montreal Protocol removes ozone-depleting substances, which is R22’s problem. India’s phase-out schedule steps down consumption over time — with milestones of 67.5% reduction by 2025 and 97.5% by 2030, and a small servicing tail permitted until 2040. Room ACs are no longer manufactured with it. Practical effect: R22 remains legal to service, but the supply narrows every year and the price behaves accordingly.

The Kigali Amendment, which India ratified in 2021, phases down HFCs for climate reasons — that is R410A and, further out, R32. India’s path freezes consumption at a baseline from 2028, then cuts it by 10% in 2032, 20% in 2037, 30% in 2042 and 85% in 2047. R410A, carrying roughly three times R32’s GWP, is commercially the first to be squeezed.

Translated into a buying decision: a machine bought today will spend its entire working life inside a supply that keeps tightening. If two models are otherwise comparable, the R32 one is the safer decade-long bet.

If your machine still runs R22

• Keep it while it works well. Scrapping a healthy machine on refrigerant grounds alone rarely pays; a genuinely inefficient old fixed-speed unit is a different calculation.
• Fix the leak instead of repeating the top-up. A sealed circuit does not consume gas. An annual refill is a diagnosis nobody performed, and with R22 it is an increasingly expensive one.
• Refuse retrofit offers. « We will convert it to R32 » is not a manufacturer-sanctioned operation on a domestic split.
• Check the plate before buying used. An R22 machine on the second-hand market is worth materially less, for exactly the reasons above — one of the checks in our guide to buying a second-hand AC.
• Dispose of it properly. At end of life the charge should be recovered, not vented.

Four things to check on the rating plate

• The refrigerant designation and the factory charge weight, photographed on installation day.
• Whether the model is inverter or fixed-speed — the bigger lever on running cost.
• The coil material and coating, which decide lifespan on the coast.
• Whether the brand’s service network in your city actually stocks that refrigerant. Compare the options on our Indian AC and cooler brands page.

Frequently asked questions

Is R32 better than R410A?

For a domestic split, yes on balance. It has roughly a third of the global warming potential, needs less gas by weight for the same cooling, and being a single compound it can be topped up coherently instead of requiring a full recover-and-recharge after a leak. Its only meaningful drawback is the A2L mild flammability class, which affects how a technician works on the machine rather than how you use it. On efficiency alone, the star rating decides — not the gas.

Can I refill my R410A air conditioner with R32?

No. The two run at different pressures and use different compressor oils, and one is mildly flammable while the other is not. A conversion is not a manufacturer-approved operation on a domestic split, it makes the system unreliable, and it ends any warranty claim. If a technician offers it, find another technician.

Is R22 banned in India?

It is being phased out rather than switched off. New room air conditioners are no longer manufactured with it, while servicing existing machines remains permitted through a shrinking allowance, with a small tail running to 2040 under India’s Montreal Protocol schedule. In practice that means an R22 machine still works, but each refill costs more and is harder to source than the last.

How often should an AC need a gas refill?

Ideally never. A refrigerant circuit is sealed and does not consume its charge, so a machine that is low on gas has a leak somewhere — a flare joint, a service valve, a corroded coil. A technician who tops it up every summer without ever running a leak test is selling you the same kilogram repeatedly. Insist on the leak being found, which is also the cheaper answer over a decade.

Read next

• Split AC not cooling: the checks that come before a gas refill
• AC gas refilling in India: when it is needed, and when it is not
• Error codes and blinking lights: what an Indian split AC is telling you
• BEE star ratings and ISEER: reading the Indian energy label
• The wiring behind the AC: circuit, MCB, earthing and sanctioned load

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