What Is an Aircon Refrigerant Top Up?
Your aircon does not cool the air by magic. It uses a chemical substance called refrigerant - commonly referred to as “gas” in Singapore - to absorb heat from indoor air and release it outside. This refrigerant circulates through a closed loop of copper piping between the indoor evaporator coil and the outdoor condenser unit. When refrigerant levels drop below the optimal amount, your aircon loses its ability to cool effectively. This is a common issue across Yishun’s residential estates, from older HDB flats along Chong Pang to newer condos near Khatib MRT.
An aircon gas top up involves a licensed technician adding the correct type and amount of refrigerant to your system, restoring it to the manufacturer’s specified charge level. This is one of the most common fixes for an aircon that is not blowing cold air. In cases where the system has not been maintained for over six months, a chemical wash or chemical overhaul may also be recommended alongside the refrigerant recharge.
It is important to understand that a properly installed and sealed aircon system should not lose refrigerant. If your aircon needs frequent gas top ups, it means there is a leak somewhere in the system that needs to be found and repaired. Simply topping up the gas without fixing the leak is like filling a bucket with a hole. Regular general servicing helps detect low refrigerant levels early before they cause compressor damage.
Billy Aircon Yishun always checks for leaks before topping up refrigerant. Our team, led by Thomas Lim, a BCA-certified technician with 10 years of experience, informs you of the leak location, severity, and repair cost so you can make an informed decision. Every gas top up is backed by our 90-day workmanship warranty.
R22, R410A and R32 Refrigerant Pricing
Different aircon systems use different types of refrigerant. The type of gas your aircon uses depends on the brand, model, and when it was manufactured. Using the wrong type of refrigerant will damage your system. Below are our 2026 gas top up rates.
R22 (Freon) - $50 to $80
R22 is the older generation refrigerant that was standard in aircon systems manufactured before 2015. It is being phased out globally due to its ozone-depleting properties, but many older aircon units in Yishun’s mature HDB blocks still run on R22.
Key points about R22:
- Used in older aircon models (typically manufactured before 2010 to 2015)
- Being phased out worldwide under the Montreal Protocol
- Supply is becoming scarcer, which may increase costs in coming years
- Cannot be mixed with R410A or R32 - they are not interchangeable
- If your R22 system needs replacement, the new system will use R410A or R32
Pricing factors: The cost depends on the amount of refrigerant needed. A small top up to bring levels back to optimal may cost $50, while a system that has lost a significant amount may cost up to $80.
R410A - $60 to $150
R410A is the most common refrigerant used in residential aircon systems. It replaced R22 as the industry standard because it does not deplete the ozone layer and offers better energy efficiency.
Key points about R410A:
- Standard refrigerant for most modern aircon systems (2010 onwards)
- Operates at higher pressures than R22, requiring different equipment
- More energy efficient than R22
- Widely available and used by Daikin, Mitsubishi, Panasonic, LG, Toshiba, and Fujitsu
Pricing factors: R410A systems operate at higher pressure, and the gas itself is more expensive than R22. A straightforward top up starts from $60, while larger refills can reach $150.
R32 - $80 to $200
R32 is the newest generation refrigerant, increasingly adopted by leading brands for their latest models. Many newer units in Yishun’s BTOs and condominiums use R32.
Key points about R32:
- Used in the newest aircon models (2018 onwards)
- Lower global warming potential than R410A
- Higher energy efficiency
- Mildly flammable - must be handled by licensed professionals
- Common in newer Daikin and Panasonic units installed in Yishun BTOs
Pricing factors: R32 is more expensive than both R22 and R410A. Top up costs range from $80 for a minor refill to $200 for a major recharge.
Signs Your Aircon Needs a Refrigerant Recharge
Reduced cooling performance - Your aircon is running, but the room does not get as cold as it used to. You find yourself lowering the temperature setting further, but the air still feels lukewarm.
Aircon runs continuously without cycling off - With low refrigerant, the system cannot reach the target temperature and runs continuously, wasting electricity and straining the compressor.
Ice formation on the evaporator coil - Low refrigerant can cause ice to form on the evaporator coil. You might notice ice on the copper pipes or water leaking from the unit as the ice melts.
Hissing or bubbling sounds - Unusual hissing or bubbling sounds from the indoor or outdoor unit could indicate a refrigerant leak.
Higher electricity bills - An aircon with low refrigerant runs longer and works harder, consuming more electricity.
Warm air from one unit in a multi-split system - In multi-split systems, low refrigerant may cause one indoor unit to blow warm air while others still cool adequately.
Common Causes of Refrigerant Leaks
Vibration damage to pipe joints - Over time, compressor vibration can loosen flared connections at pipe joints. This is one of the most common causes of slow refrigerant leaks.
Corrosion of copper piping - Singapore’s humid air can corrode copper piping over many years. Pinholes develop in corroded sections, allowing gas to escape slowly. This is particularly common in older installations across Yishun’s mature estates.
Poor initial installation - Improper flaring of pipe connections or insufficient tightening during installation can result in leaks that become apparent months or years later.
Physical damage - Accidental impact to the outdoor condenser unit or piping from renovation work or other activities can damage pipes and cause leaks.
Age-related wear - Rubber seals, valve stems, and connection points degrade over time. Systems older than 8 to 10 years are more prone to refrigerant leaks.
How We Recharge Your Aircon System
Step 1 - Diagnosis
Before adding any gas, our technician tests the system’s refrigerant pressure using professional gauges. This tells us exactly how much gas has been lost.
Step 2 - Leak Detection
We inspect the system for leaks using electronic leak detectors and visual inspection of all connections, valves, and coil surfaces. If a leak is found, we provide a repair quotation.
Step 3 - Refrigerant Identification
We verify the type of refrigerant your system uses by checking the data plate on the outdoor unit.
Step 4 - Gas Top Up
Using calibrated equipment, we add the precise amount of refrigerant needed to bring the system to the manufacturer’s specified charge level.
Step 5 - Performance Test
After topping up, we run the aircon for at least 10 minutes and measure the supply air temperature, return air temperature, and refrigerant pressures to confirm correct operation.
How Billy Aircon Yishun Compares
| Feature | Typical Provider | Billy Aircon Yishun |
|---|---|---|
| Leak check before top up | Sometimes skipped | Always included |
| Licensed refrigerant handling | Varies | All technicians licensed |
| Workmanship warranty | None or 30 days | 90-day warranty |
| Pricing transparency | Quote on-site | Published rates from $50 |
| Response time | 2-3 days | 24-hour response |
| R22, R410A and R32 coverage | Limited | All three gas types |
Licensed Refrigerant Handling in Singapore
In Singapore, refrigerant handling is regulated under the Environmental Protection and Management Act. All Billy Aircon Yishun technicians who perform gas top ups are trained and licensed for refrigerant handling. We use properly calibrated equipment, follow safe handling procedures, and ensure no refrigerant is vented into the atmosphere.
