A proper aircon chemical wash in Singapore costs about $60-90 per wall unit. A full chemical overhaul runs $120-180, and basic servicing is $25-40. In our year-round humidity a chemical wash is worth it once mould clogs the coils and blower, but not every unit needs one at every visit. Here’s the honest breakdown, from a team that has cleaned 50,000+ Singapore homes.
We’re Sureclean. Most of our aircon work comes bundled with the messy jobs: post-renovation handovers, move-ins, deep cleans. So we’ve slid the cover off units in every kind of flat, from BTO to old resale to landed. What follows is what we actually see inside them, and where your money does and doesn’t make a difference.
How much does aircon deep cleaning cost in Singapore?
There is no single “aircon cleaning” price, because three different jobs hide under that one phrase. Here’s the range to expect per unit:
| Service | What it actually does | Typical price / unit | Sensible frequency |
|---|---|---|---|
| General servicing | Surface clean: wash filters, wipe front panel, vacuum coil face, check gas and drainage | $25-40 | Every 3 months |
| Chemical wash | Remove fan cover and blower, jet-wash the barrel, coils and drip tray with chemical solution *while mounted* | $60-90 | Every 12-18 months |
| Chemical overhaul | Full dismantle: blower, coil and drainage pipe removed from the wall, soaked and cleaned separately | $120-180 | Every 2-3 years, or when heavily mouldy |
What moves the price within those bands:
- Unit type. A ceiling cassette or ducted unit sits higher, often $120-200+, because the crew works overhead and the fan is harder to reach than a wall-mounted split.
- How many units. A 3-4 unit multi-split condo usually gets a per-unit discount versus a single wall unit in an HDB flat.
- How bad it is. A unit run nightly for three years with visible black growth takes longer, and sometimes needs an overhaul rather than a wash.
When you see those $20-something promo quotes, that’s a general servicing rate marketed like a deep clean. It isn’t a chemical wash. Fine to book for routine upkeep, just don’t expect it to fix a smell.
General servicing vs chemical wash vs chemical overhaul: what you actually need
The difference is simply how deep the crew goes into the machine.
General servicing touches only the parts you can reach without tools coming off: the filters, the front flap, the visible coil face. It keeps airflow decent and catches gas issues early. It does not clean the blower barrel or the drip tray, which are the two places mould actually lives.
A chemical wash takes the fan cover off and jet-washes the blower wheel, the evaporator coil and the drainage tray with a chemical solution, catching the runoff in a pail. This is the step that kills the musty smell.
A chemical overhaul pulls the whole unit apart, so the blower and coil come off the wall and soak separately. You need this when a unit has been neglected for years and the fins and barrel are caked, or when drainage is chronically blocked.
Be honest with yourself about frequency. A normal Singapore household does not need an overhaul every year. Routine servicing every few months, plus a chemical wash roughly once a year on the hard-working bedroom units, covers most homes.
Why your aircon still smells musty even after regular servicing
This is the single most common complaint we hear, and the answer is almost always the same: you’ve been booking servicing, not a chemical wash.
The musty, sour smell comes from mould and biofilm growing on the blower barrel and sitting in the drip tray, the wet, dark, 25°C parts of the unit your air blows across before it reaches you. General servicing never opens those up, so the smell comes back a week after every visit. Only a chemical wash physically scrubs and flushes them.
If your bedroom unit runs all night and still smells within days of a service, that’s your signal it’s overdue for a proper wash. If it’s been years, it may need an overhaul plus a round of disinfection services to reset the room.
Why is your aircon leaking or dripping water inside the house?
Water dripping from the indoor unit is almost never a “the unit is broken” problem. It’s a blocked drainage problem. Over months, the same mould and dust that cause the smell also sludge up the drip tray and drainage pipe. Water that should flow outside backs up and overflows into your room instead.
A chemical wash clears the tray; an overhaul clears the pipe run. If a company’s first answer to a leak is “you need a gas top-up,” be sceptical. Leaks are a drainage issue far more often than a refrigerant one.
How often should you chemical wash in Singapore’s humidity?
Singapore sits at roughly 30°C and 80-90% humidity all year, and most of us run the bedroom aircon overnight. That’s a perfect mould incubator: warm, wet, dark, running for hours. It’s why units here need cleaning far more often than in a dry climate.
Our rule of thumb:
- Bedroom units (nightly use): chemical wash every 12-18 months, general servicing every 3 months in between.
- Living or occasional-use units: chemical wash every 18-24 months is usually enough.
- Any unit that already smells or drips: don’t wait for the schedule, clean it now.
Should you clean your aircon before moving into a new BTO or resale flat?
Yes, and do it before you move in, not after you’ve settled. A big share of our aircon jobs ride along with post-renovation cleaning and move-in/move-out cleaning for exactly this reason.
Renovation throws off fine cement and silica dust so light it floats for days and settles everywhere, including inside the aircon coils, the blower and the tracks. Switch the unit on with that dust inside and it bakes onto the fins, chokes airflow and blows construction grit straight into the room you’re about to sleep in. New BTO or resale, a pre-move-in wash means you start with clean air instead of a machine full of renovation dust. Full details on how we handle new-unit cleans are on our aircon cleaning service page.
Is a chemical wash worth it, or a waste of money?
Straight answer: worth it when there’s something to clean, a waste when there isn’t.
If your unit runs nightly, is over a year past its last real wash, or already smells or drips, a chemical wash is one of the best-value maintenance dollars you’ll spend. Clean coils cool faster and pull less electricity, and you stop breathing mould spores in your sleep.
But we’ll also tell customers no when the answer is no. A six-month-old unit that was properly washed and still smells fresh doesn’t need another chemical wash. It needs a $25-40 servicing to keep the filters clear. Any company pushing a full overhaul on a nearly-new, clean unit is selling, not diagnosing.
Can you just DIY it? You can rinse the filters and wipe the front panel yourself every few weeks, and you should, it genuinely helps. But the blower, coil and drainage need the unit partly dismantled and a proper chemical solution. DIY here risks bending the delicate fins or wetting the fan motor, and you can’t reach the barrel where the smell actually lives. The filter is DIY. The deep clean isn’t.
Red flags and scams when hiring an aircon company in Singapore
A few things that should make you pause:
- No written quote. A proper company tells you the per-unit price and service type *before* starting. Verbal-only pricing invites the surprise add-on.
- The instant “gas top-up” upsell. Sometimes real, often not. Ask them to show you the pressure reading first.
- No floor sheets or protection. A chemical wash produces black water. If the crew doesn’t lay down sheets and bring pails, they don’t do this often.
- “Chemical wash” prices that are secretly servicing. A $25 “wash” is a filter clean. Know which job you’re paying for.
- A freelancer with one spray bottle. A real wash needs a pump sprayer, chemical solution, water containment and the confidence to remove the blower. One bottle of spray-and-wipe is not a chemical wash.
We employ, train and insure our crews rather than sending gig freelancers, precisely so the floor gets protected and the job gets done the same way every time. It’s the same standard behind our 4.9-star rating across 1,476 Google reviews.
Can a dirty aircon make your family sick?
It can absolutely make things worse. A blower coated in mould blows spores into a closed, air-conditioned bedroom for hours every night, which is exactly the environment that aggravates allergies, blocked noses and night coughing, especially in kids. Add Singapore’s dust-mite-friendly humidity and haze-season particulates, and a neglected unit becomes a small pollution source pointed at your pillow. Cleaning it won’t cure an allergy, but it removes one avoidable trigger from the room.
Frequently Asked Questions
How much does an aircon chemical wash cost per unit in Singapore? Expect about $60-90 per wall-mounted unit for a chemical wash, and $120-180 for a full chemical overhaul. Ceiling cassettes run higher, and multi-unit condos usually get a per-unit discount. General servicing is separate, at $25-40.
How often should I chemical wash my aircon in Singapore’s humidity? For bedroom units running nightly, every 12-18 months, with a general servicing every 3 months in between. Living-room units used occasionally can stretch to 18-24 months. If it already smells or drips, don’t wait, clean it now.
Why does my aircon still smell musty even after servicing? Because general servicing only cleans the filters and front panel. It never reaches the blower barrel and drip tray where mould actually grows. Only a chemical wash scrubs and flushes those parts, which is what kills the smell.
Can I chemical wash my aircon myself? You can and should rinse the filters and wipe the panel regularly. But the blower, coils and drainage need the unit partly dismantled and a proper chemical solution. DIY here risks bending the fins or wetting the fan motor, and you can’t reach where the smell lives.
Do I really need to clean my aircon after renovation? Yes. Fine cement and silica dust settle inside the coils and blower and bake on once you run the unit. Clean it before you move into a new BTO or resale flat, not after, otherwise you’re blowing renovation dust into your bedroom.
How long does a chemical wash take, and can I sleep in the room that night? Roughly 45-60 minutes per unit. Yes, you can sleep in the room the same night. Once the unit is reassembled and dry, it’s ready to run.
Clean air, no guesswork
Aircon cleaning in Singapore isn’t complicated once you know which of the three jobs you actually need, and when you don’t need any of them yet. If your unit smells, drips, or you’re moving into a freshly renovated flat, that’s the moment a proper chemical wash earns its keep. Not sure whether yours needs a wash, an overhaul, or just a filter clean? Tell us the unit’s age, how often it runs and what you’re smelling, and we’ll give you a straight answer and a per-unit quote. See our aircon cleaning service to request one.
