What Is an Aircon Gas Top Up?
Your aircon uses refrigerant gas to absorb heat from indoor air and release it outside. When the refrigerant level drops below the required amount, your aircon loses its ability to cool effectively. This is one of the most common reasons your aircon is not cold.
An aircon gas top up restores the refrigerant to its correct level, bringing back full cooling performance. At Billy Aircon, every gas top up includes a leak detection check to identify why the gas level dropped in the first place. Without finding and fixing the leak, you will face the same problem again within weeks or months.
Billy Aircon provides gas top up services for all residential and commercial aircon systems across Singapore. We carry R22, R410A, and R32 refrigerant types and can service units from every major brand — Daikin, Mitsubishi, Panasonic, Midea, Samsung, LG, and more.
Refrigerant Types and Pricing
Different aircon models use different refrigerant gases. Using the wrong type can damage your compressor permanently. Billy Aircon’s technicians identify the correct refrigerant from your unit’s specifications before any top up.
Gas Top Up Pricing Table
| Refrigerant Type | Price Range | Common In |
|---|---|---|
| R22 (Freon) | $80–$200/unit | Older units (pre-2015) |
| R410A | $50–$150/unit | Most modern split systems |
| R32 | $60–$160/unit | Newer energy-efficient models |
Pricing varies based on the amount of gas needed. A minor top up costs less than a full recharge. Our technician measures the exact pressure before and after to charge only what your system requires.
Understanding the Different Refrigerant Types
R22 (Freon): This is the older generation refrigerant found in aircon units manufactured before 2015. R22 is being phased out globally due to its ozone-depleting properties. Supply is becoming limited, which drives up the cost. If your unit uses R22, consider upgrading to a newer system that uses R410A or R32.
R410A: The most widely used refrigerant in modern split aircon systems in Singapore. R410A does not deplete the ozone layer and offers better cooling efficiency than R22. It operates at higher pressure, so the piping and components must be rated for R410A.
R32: The newest refrigerant gaining popularity in energy-efficient aircon models from Daikin, Panasonic, and Mitsubishi. R32 has a lower global warming potential than R410A and requires 30% less refrigerant charge to achieve the same cooling output. It is mildly flammable, so handling requires trained technicians.
Signs Your Aircon Needs a Gas Top Up
Refrigerant does not get consumed during normal operation. If your gas level is low, it means there is a leak somewhere in the system. Here are the telltale signs:
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Aircon running but not cold: The most obvious sign. Your aircon blows air, but the air is lukewarm or only slightly cool. This is different from a dirty filter issue — with low gas, the temperature difference between inlet and outlet air is minimal.
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Ice forming on pipes or coils: When refrigerant is low, the evaporator coil gets excessively cold in localised spots, causing moisture to freeze. You may see frost on the copper pipes connecting the indoor and outdoor units.
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Aircon taking longer to cool the room: Even if the air feels somewhat cool, a low gas charge means your aircon takes significantly longer to bring the room to the desired temperature.
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Higher electricity bills: A gas-starved aircon runs its compressor continuously, trying to reach the set temperature but never quite getting there. This constant operation drives up your power consumption.
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Hissing or bubbling sounds: A refrigerant leak can sometimes produce audible hissing from the area where gas is escaping. Bubbling sounds may come from the outdoor condenser.
If you notice any of these symptoms, contact Billy Aircon for a diagnostic check. Continuing to run an aircon with low gas puts excessive strain on the compressor, which is the most expensive component to replace.
Our Gas Top Up Process
Billy Aircon follows a systematic process to ensure your gas top up is done correctly and the underlying leak is addressed.
Step 1: Diagnostic Assessment
Our technician connects a manifold gauge to your outdoor condenser’s service ports to measure the current refrigerant pressure. This reading, combined with the ambient temperature, tells us exactly how much gas your system has lost.
Step 2: Leak Detection
Before adding any gas, we perform a leak check. Using an electronic leak detector and soapy water solution, we inspect all pipe joints, flare connections, the indoor evaporator coil, and the outdoor condenser coil for signs of leakage.
If a leak is found, we inform you of the location and provide a repair quote. Minor leaks at flare joints can often be fixed on the spot by re-tightening and re-flaring the connection. Larger leaks in the coil or piping may require part replacement.
Step 3: Gas Charging
With the leak identified and addressed, we connect the refrigerant cylinder to your system and charge the correct amount of gas. We monitor the pressure gauge throughout the process to ensure the charge matches the manufacturer’s specifications.
Step 4: Performance Verification
After the top up, we run your aircon for 10 to 15 minutes and measure the outlet air temperature. A properly charged system should produce air that is 8 to 12 degrees Celsius cooler than the room temperature. We also verify that the compressor is cycling normally and there are no unusual vibrations or sounds.
Step 5: Documentation
We record the before and after pressure readings, the amount of gas added, and any issues found during the leak check. This information is useful for tracking your system’s health over time.
How Long Does a Gas Top Up Last?
A properly sealed aircon system should hold its refrigerant charge for the entire lifespan of the unit — typically 8 to 15 years. If you find yourself needing gas top ups every 6 to 12 months, it strongly indicates an ongoing leak that needs to be repaired.
Billy Aircon’s 90-day warranty covers any gas-related issues following our service. If your aircon stops cooling within 90 days of our gas top up, we return to diagnose and resolve the issue at no additional charge.
Can I Top Up the Gas Myself?
Aircon gas top up is not a DIY task. It requires specialised equipment (manifold gauges, vacuum pump, refrigerant cylinders), knowledge of the correct operating pressures for your specific unit, and an understanding of refrigerant safety. Incorrect charging can damage the compressor, cause ice buildup, or create safety hazards — particularly with the mildly flammable R32.
Always engage a trained aircon technician for gas-related work. Billy Aircon’s team is experienced with all refrigerant types and follows safe handling protocols for every job.
Frequently Asked Questions
How do I know which gas type my aircon uses?
Check the label on your outdoor condenser unit. It lists the refrigerant type (R22, R410A, or R32) along with the required charge amount. If you cannot find it, send us a photo of your unit via WhatsApp and we will identify it for you.
Why is R22 more expensive than R410A?
R22 is being phased out globally due to environmental regulations. As supply decreases, the price increases. If your unit uses R22, you may save money long-term by upgrading to a newer system that uses R410A or R32.
How long does a gas top up appointment take?
Most gas top ups are completed within 30 to 45 minutes per unit, including the leak detection check and performance verification.
Is it normal for aircon gas to leak?
No. A properly installed and maintained aircon system should not leak gas. Leaks typically occur at pipe joints, flare connections, or through corrosion in the evaporator or condenser coils. Regular servicing helps catch early signs of wear before they become leaks.
What happens if I keep running my aircon with low gas?
Running on low gas forces the compressor to work harder and longer. This increases electricity consumption and accelerates compressor wear. Eventually, the compressor overheats and fails — a repair that can cost $800 to $1,500 or more. Learn how to spot the early signs of low aircon gas before it causes serious damage.
Book Your Gas Top Up
If your aircon is not cooling properly, a gas top up may be all it needs. Billy Aircon provides fast, reliable gas top up services across Singapore with leak detection included and a 90-day warranty.
WhatsApp us at +65 9456 0875 to book your appointment today. For a complete list of our services and pricing, visit our aircon servicing price page.
