Does Air Conditioning Gas Need Topping Up Every Year? How to Tell If Refrigerant Is Low

No, air conditioning gas does not need topping up every year. Refrigerant circulates in a closed circuit and does not run out in normal use; if it is low, there is a leak somewhere in the system. That is why the right fix is not simply adding gas, but finding and repairing the leak, evacuating the system with a vacuum and recharging with the type and quantity shown on the unit's label.

What Does Refrigerant Do in an Air Conditioner?

Refrigerants such as R32, R410A or, in older units, R22 circulate through the copper pipes between the indoor unit and the outdoor unit, picking up heat in one place and carrying it to another. In cooling mode they move heat from inside to outside; in heating mode they bring heat from outside in. Along the way the refrigerant changes between liquid and gas, but it is not burnt, it is not used up and, in a sound system, it does not escape.

A common misconception is to think of air conditioning gas like the fuel in a car. A better comparison is a sealed central heating system: if it does not leak, the amount inside stays the same for years.

What Does Your Unit's Label Tell You?

Every air conditioner has an information label on its outdoor unit, usually on the side. It shows which refrigerant the unit uses and how much was charged at the factory. The service technician works out the recharge quantity from this information and the pipe length of the installation. You can read the label yourself, but do not try to reach an outdoor unit that is mounted high up or in an unsafe position.

Why Does Gas Run Low? Possible Sources of a Leak

The only explanation for refrigerant going down is a leak in the circuit. Leaks are usually found at the following points:

• Flare connections: Connections that were not tightened enough or were badly flared during installation can start to leak over time.
• Copper pipes: Vibration, crushing or corrosion can create small holes.
• Coils: Small corrosion-related leaks can develop over time in the indoor or outdoor unit coils, particularly because of salty, humid coastal air. This is why outdoor units should be checked regularly in areas close to the sea, such as Didim and Kuşadası.
• Service valves: Valve caps and seals can also be a source of leaks.
• Poor removal and reinstallation: If the gas is not pumped down into the outdoor unit when the unit is moved, or the connections are not remade properly, refrigerant will be lost.

How Can You Tell If Refrigerant Is Low?

Some signs may point to low refrigerant, but the same signs can also appear with a dirty filter, a blocked coil or an electrical fault. So a definite answer only comes from taking measurements.

• The unit runs, but the air it blows is not cold or warm enough.
• The room is slow to reach the set temperature and the unit runs almost non-stop.
• Ice forms on the indoor unit, on the thin pipe at the outdoor unit or at a connection point.
• Electricity consumption seems higher than before.
• Oily marks have appeared on the outdoor unit connections; the oil that circulates with the refrigerant can leave a trace at the leak point.

If you notice any of these signs, first make sure the filters are clean and that the unit is running in the right mode at a suitable temperature. We look at other reasons for poor cooling in our article on why an air conditioner is not cooling, and at high consumption in our article on air conditioners using too much electricity.

Why Is Just Adding Gas Not Enough?

Adding gas without repairing the leak is like pumping up a punctured tyre: the unit works well for a while, then the same problem comes back. There are a few further problems too:

• Air and moisture can get into the system through the leak point; moisture in the circuit can, over time, damage internal parts and the compressor.
• If gas is added "by eye" without measuring the quantity, the system can end up over- or undercharged; both reduce efficiency and put strain on the compressor.
• With blended refrigerants such as R410A, the components may not be lost in equal proportions during a leak, so it is preferable to empty and recharge the system rather than top it up.
• Adding a different type of refrigerant can seriously damage the unit. Only the refrigerant the unit is designed for should be used.

In short, an air conditioner that needs gas adding every year is really one whose leak is left unrepaired every year.

The Correct Checking and Recharge Process

1. Initial checks and measurements: The filter, coil, fan and electrical values are checked, and operating pressures are measured with a manifold gauge.
2. Leak test: Connections, valves and accessible pipework are checked using methods such as a bubble test, an electronic detector or, where necessary, a nitrogen pressure test.
3. Repair: The leak point found is repaired appropriately, for example by remaking the flare connection, brazing or replacing a part.
4. Vacuum: Air and moisture are removed from the circuit with a vacuum pump. If this step is skipped, the recharge will not be sound.
5. Recharge to the label: A weighed recharge is carried out based on the refrigerant type and quantity on the unit's label, taking the pipe length into account.
6. Operating check: The unit is switched on and the pressures, outlet air temperature and general operation are checked.

At Evime Servis we diagnose the fault on site during this process and tell you what work will be done and what it will cost before we start. We give a written guarantee on parts and labour; when the job is finished, the service report you sign on the phone is emailed to you as a PDF. For refrigerant (gas) recharge and our other air conditioning services, see our private air conditioning service page.

What Can You Do Yourself?

It is not safe for users to interfere with the refrigerant circuit; valves, pipes and electrical parts are a job for the service technician. What you can do is limited but effective: wash and dry the filters regularly, set the mode and temperature correctly on the remote control, move anything blocking the front of the outdoor unit, and not put off a check when you notice a drop in performance. Pre-season maintenance means a small leak can be spotted before it gets worse; see also our article on pre-summer air conditioning maintenance.

If your air conditioner is not cooling as it used to, or you have been told it needs gas adding every year, you can submit a service request in Didim, Söke, Kuşadası or Aydın city centre (Efeler) to find the source of the leak, or call +90 256 503 48 80. You can also message us on WhatsApp on the same number.

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Published: 25.10.2026 · Last updated: 25.10.2026