Most people book an aircon service assuming the technician will open the unit, rinse the filters, check the gas, and that’s that. For a system that’s only slightly dusty, that’s often enough. For a unit that’s been smelling musty for months or barely cooling despite running non-stop, that same routine visit usually isn’t, because by then the problem has typically moved past what a filter rinse can reach.
Why a Filter Rinse Doesn’t Always Fix the Smell
A musty smell coming from an aircon unit is almost always a sign of mould or bacterial build-up on the evaporator coil and fan blades, parts a standard filter rinse never actually touches. Singapore’s humidity gives mould an easy foothold inside a unit that runs for hours a day, cycling warm, moist air across cool metal surfaces perfectly suited to it. Proper aircon cleaning services typically go further than a filter wash, involving a full teardown of the fan coil unit so the coil, fan blade, and drainage tray can be cleaned directly rather than just wiped from the outside. That distinction, reaching the parts actually causing the problem instead of the parts around it, is usually what decides whether a smell goes away for good or just fades for a week.
The Chemical Wash Most People Don’t Know to Ask For
Beyond a standard clean, many units eventually need what’s usually called a chemical wash: a deeper overhaul involving dismantling the indoor unit and soaking its components in a cleaning solution strong enough to strip built-up grime, mould, and bacteria that a simple rinse leaves behind. This tends to come up most often in units that haven’t had one in a year or two, units in kitchens or smoking households, or ones where cooling output has visibly dropped despite the gas level being fine. It’s a longer, messier job than a general service, which is part of why it isn’t offered as a default and usually needs to be specifically requested or recommended after an inspection.
Signs It’s Time for More Than a Routine Wipe-Down
- A musty or sour smell that returns within days of a general service.
- Visible water stains or dripping around the indoor unit, even after filters are cleaned.
- Noticeably weaker airflow or longer cooling times than the unit used to need.
- Visible black specks on the fan blades or vents when the front panel is opened.
Why This Matters More Than Just Comfort
A coil or fan blade covered in mould doesn’t just smell unpleasant; it recirculates whatever’s growing on it back into the room every time the unit runs. That’s a meaningful part of why people searching for the best aircon servicing in Singapore are often dealing with more than a comfort issue, especially in households with young children, allergies, or anyone who spends long hours working from a room with the aircon running most of the day. A clean coil doesn’t just cool better; it stops actively contributing to what’s circulating through the air in that room.
How Often This Actually Needs to Happen
General servicing every two to three months is the usual recommendation for units running daily in Singapore’s climate, mainly to keep filters and the immediate surfaces clean. A deeper chemical wash is on a different timeline, closer to once a year for most households, though a unit in a kitchen, near heavy dust, or used by smokers may need it more often. None of this is a fixed rule a technician can apply blindly, since the right interval depends on usage hours, the room’s humidity, and how the unit has been performing, which is exactly why a quick inspection tends to be more useful than guessing at a schedule in advance.
A unit that’s cooling properly and smells clean isn’t necessarily one that’s had the deepest clean available; it might just be one that was looked at before the build-up had a chance to settle in. Catching that stage early tends to be a smaller, cheaper job than waiting for the smell or the weak airflow to force the issue later.
Figuring out whether a unit just needs a routine rinse or something closer to a full chemical wash is easiest to tell from an actual look at it, not a guess based on how long it’s been. Contact Newway Air Conditioning to get that looked at.
