AC Gas Refill Guide
An AC does not use up its gas. If a properly installed AC needs gas, there is a leak. Fix the leak first, then refill, or you will pay again next summer.
Updated 11 November 2026
Does an AC need gas every year?
No. The refrigerant runs in a sealed loop. A new inverter AC that was installed with good flare joints and a proper vacuum should run for many years without a refill. Technicians who "top up" gas every summer are often hiding a slow leak.
Signs your AC may be low on gas
- It runs but the air is only slightly cool
- Ice forms on the indoor coil or the thin copper pipe
- Oily marks at pipe joints
- A hissing sound near the joints
But first rule out dirty filters, a dirty outdoor coil and low voltage: these cause the same symptoms. See AC not cooling.
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Which gas: R32, R410A or R22?
- R32: used by many new inverter ACs; efficient, mildly flammable, needs a technician with the right tools.
- R410A: common in inverter ACs from the last decade.
- R22: old non inverter ACs; being phased out.
Never mix gases. The correct gas is printed on the outdoor unit's label and in each model's specs on this site.
What affects the gas refill cost
- Gas type (R32 and R410A cost more than R22)
- How much is needed (full charge or top-up)
- Ton size
- Leak finding and repair, nitrogen test and vacuum
- City and technician
Ask for a written quote that includes the leak test, not only the gas.
Related pages
Frequently Asked Questions
When should we refill AC gas?
Only when a technician has found and fixed a leak and confirmed low pressure with gauges.
Which AC gas is best?
Use the gas the AC was designed for. Many new inverter ACs use R32.
AC gas kitne ki aati hai?
Gas ki qeemat gas ki qisam, ton aur leak repair par depend karti hai. Pehle leak theek karwayein, phir gas bharwayein.
How much gas is in a 1.5 ton AC?
The factory charge is printed on the outdoor unit's label, in kg or grams, and it differs by model and gas. A technician should weigh gas in, not guess.
What gas pressure should a 1.5 ton AC have?
It depends on the gas type, the outdoor temperature and whether the AC is running. A trained technician reads it with gauges and compares it with the brand's chart.
How do I know if my AC gas is leaking?
Weak cooling, ice on the thin pipe, oily marks at the joints or a hissing sound are signs. A technician confirms it with a nitrogen or bubble test.
Is an AC gas leak dangerous?
In a normal room a small leak is not usually harmful, but air out the room. R32 is mildly flammable, so keep flames away and get the leak fixed.
Can gas be charged in an inverter AC the same way?
The basic steps are the same, but inverter ACs are more sensitive to the correct amount, so gas should be weighed in after a vacuum.
Which gas do new ACs use?
Most new inverter ACs listed here use R32, such as Haier HSU-18HFPCA 1.5 Ton Inverter AC; some use R410A, such as Midea 18HRFN (Xtreme Plus) 1.5 Ton Inverter AC. Check each model's specs.
