An aircon that runs all day but never quite cools the room is trying to tell you something. In most cases the problem is not the unit itself — it is the gas inside it. Low refrigerant means weak cooling, longer running times and higher bills, and the fix is a professional ac gas refill. Twin City Air-Conditioning Engineering has handled gas top-ups, repairs and servicing across Singapore for over 30 years, since it was founded in 1992 as Seng Teck Air-Con Refrigeration Electrical Engineering and rebranded as Twin City in 1999.
What the Gas Does
The gas inside your aircon — the refrigerant — is what carries heat out of your room. It circulates through the coils, absorbs heat from the indoor air, and releases it outside. When the gas level drops, the system cannot move heat as fast as it should, so the room stays warm even though the unit is running. That is the first sign that an ac gas refill may be needed: the aircon is on, the fan is blowing, but the air coming out is not cold enough.
Why Gas Runs Low
Aircon gas does not get used up like fuel — it circulates in a sealed system, so a low level almost always means a leak. A loose joint, a worn valve or a damaged pipe lets the gas escape slowly, and the cooling gets weaker week by week. That is why a good ac gas refill starts with a leak check, not just a top-up: topping up a leaking system is a waste of money, because the new gas escapes the same way. Twin City's technicians find and fix the leak first, then top up the gas to the right level.
The Signs Your Aircon Needs Gas
If your aircon is not cold, making noise, leaking water, or has weak airflow, it is a sign you need servicing to restore performance and prevent further issues. Weak cooling is the clearest sign of low gas, and it often comes with ice forming on the coils or the unit running far longer than it used to. Booking an ac gas refill at the first sign — not after the unit stops completely — keeps the fix small and protects the compressor from the extra strain of running on low gas.
What Happens During a Refill
A refill visit is more than just adding gas. The technicians inspect the system, check for leaks, test the pressure, and only then top up the gas to the correct level. They also check the filters, the coils and the drainage, because a unit that needs gas often needs a clean too. The best ac gas refill is part of a full service: the leak fixed, the gas topped up, and the unit left running the way it should. Twin City handles pressure testing, system inspections and preventive care as part of regular maintenance, so the unit is checked from every angle.
For Homes and for Businesses
Homes run on single-split and multi-split systems; offices, clinics, retail shops and warehouses run on ceiling cassette, ducted and VRV/VRF systems — and a gas refill is not the same job on each one. Twin City services both, from a bedroom unit to a full commercial installation, with the same team and the same standard of work. For a business, that matters most: a shop or clinic cannot close while the aircon is down, which is why the company offers same-day aircon service and quick turnaround times. Choosing an ac gas refill from a company that covers homes and businesses means one number to call whatever the property is.
Fair Prices and a Promise
Transparent pricing means no hidden fees and no surprises — just a fair, upfront quote so you can make an informed decision confidently. That standard is what any ac gas refill should offer: a price agreed before the work starts, not discovered after it. Twin City backs its work with certified and skilled technicians, a satisfaction guarantee, and a record of customers who stay with the company for the long run. The company has served Singapore for over 30 years, and the phone number is 6788 9391.
