The Truth About Aircon Gas Top-Ups in Singapore: Why Sealed Systems Don't 'Consume' Gas (And How to Stop Water Leaks Permanently)

The Truth About Aircon Gas Top-Ups in Singapore: Why Sealed Systems Don't 'Consume' Gas (And How to Stop Water Leaks Permanently) It is the most-repeated aircon story in Singapore: the servicing man spends five minutes vacuuming, then delivers the line — "Uncle, your gas is zero, must top up $120 per fancoil." Forum threads about this exact script run to hundreds of posts. Some homeowners report that when they refused, the technician packed up and left without even finishing the cleaning they paid for. Here is the engineering truth that protects you from it. Your aircon does not consume gas An air conditioner is a sealed, closed-loop refrigeration system. The refrigerant circulates in a continuous loop, changing state from liquid to gas and back, and is never burned, used up or worn out. Unlike engine oil, it does not degrade with use. A healthy system can run for its entire service life on its original charge. So when is gas genuinely low? In exactly one situation: there is a physical leak — a cracked flare joint, a corroded copper U-bend, a punctured coil. And the honest fix for low gas is never "top up and leave". It is: locate the leak, repair it, pressure-test the system, vacuum it, and only then recharge to the manufacturer's specified weight. A top-up without leak repair is money evaporating into the atmosphere — the gas will simply escape again, and you will be sold another top-up in six months. The follow-up question that exposes the scam When told your gas is low, ask: "Where is the leak, and can you show me the pressure readings?" A legitimate technician can demonstrate low pressure on gauges and explain the leak-search process. A scammer's script tends to fall apart at this question. The other midnight emergency: water dripping on your bed The second great aircon complaint is the 3 AM drip — water from the fancoil onto the mattress and parquet, warping floorboards. The cause is almost always a choked condensate drain: the slime jelly that grows in the drain pan and pipe eventually blocks the flow, and the pan overflows. The quality divide is in the clearing method. Budget servicing sometimes means the technician blowing into the drain pipe — yes, literally, as Google reviews of budget operators describe — which shifts the jelly a few centimetres and buys you ten days. The permanent fix is a wet vacuum extraction of the drain line plus cleaning of the rear drain pan, the hidden tray that basic servicing never touches (and whose neglect explains the musty, damp-sock smell some units blow immediately after a "service"). Chemical wash vs chemical overhaul — and the acid danger - Normal servicing (~$15–$30/unit): filters, covers, drain flush, coil surface clean. Right for regular maintenance. - Chemical wash (~$60–$90): coil and blower cleaned with chemical solution in place, for units with embedded dirt or odour. - Chemical overhaul (~$130–$180): the fancoil is fully dismantled and every component cleaned individually — for severe clogging or long-neglected units. One warning that appears repeatedly in renovation forums: un-neutralised caustic chemical left on the coil can corrode through copper U-bends within weeks, turning a $180 wash into a dead fancoil. Ask what chemical is used and how the coil is rinsed and neutralised. And the blinking light A blinking timer light is an error code, not a mood. It points to a specific fault — a thermistor, a board, a fan motor capacitor. Be wary of the technician who power-cycles the isolator, declares it fixed, collects $60 and leaves; homeowners report the fault returning within the hour. Equally, be wary of the opposite extreme: the "burnt compressor, $1,800 replacement" diagnosis that a second opinion reveals to be a $45 capacitor. Error codes should be read, tested and shown to you. How often should you actually service your aircon? For a typical Singapore household running units nightly, a general service every three to four months keeps filters, coils and drains clear. Heavy-use or kitchen-adjacent units may need shorter intervals; a guest room unit can stretch longer. The point of the schedule is prevention: a maintained drain never drips on your parquet at 3 AM, and a clean coil never needs rescuing with aggressive chemicals. Between services, you can wash the filters yourself monthly — it takes ten minutes and does more for cooling performance than any additive a salesman can offer. How AOT handles this Alpha & Omega Trinity's aircon work starts with diagnostics, not scripts: gauge readings before any gas discussion, leak search before any recharge, wet-vacuum drain extraction as standard, and component testing before any replacement is recommended. You see the readings and the failed part before you approve the bill. For an honest aircon diagnostic, WhatsApp or call +65 8151 8857. We operate Monday to Saturday, 8:00 AM to 5:00 PM (closed Sundays). Frequently Asked Questions How much does aircon servicing cost in Singapore? General servicing is typically priced per fan-coil unit, with chemical wash and chemical overhaul costing more. Price varies by unit count, access, and condition. AOT publishes transparent per-unit rates and confirms the total before starting — no on-site inflation. For an exact quote for your units, WhatsApp +65 8151 8857. Does my aircon really need a gas top-up? Usually no. Refrigerant circulates in a sealed loop and does not get 'used up' — if gas is low, there is a leak, and topping up without finding the leak wastes money and harms the compressor. AOT technicians perform a leak test first and show you the pressure readings before recommending any top-up. This is the most common aircon upsell scam in Singapore; a honest diagnosis protects you. Why is my aircon leaking water? The most common causes are a clogged condensate drain pipe, a dirty evaporator coil causing ice melt overflow, or a cracked drain pan. Regular servicing prevents most leaks. If water is dripping from the unit, switch it off to prevent ceiling damage and book a service — AOT handles drainage flushing, coil cleaning, and pan repair. How often should aircon be serviced in Singapore? For daily-use residential units, general servicing every 3–4 months keeps efficiency up and prevents leaks and mould. Commercial and F&B premises usually need monthly servicing due to heavier load and grease. AOT offers scheduled maintenance contracts for homes, offices, and commercial kitchens with service reminders. Alpha & Omega Trinity Pte Ltd is one of Singapore's few contractors holding PUB plumber licence WS16882018, EMA-licensed electricians, BCA L1 registration (ME01/ME06/ME12), and bizSAFE Level 3 (E18947) — one accountable, fully licensed team for every trade.