# Aircon Chemical Overhaul Ang Mo Kio | S$130-S$180/Unit

> Aircon chemical overhaul in Ang Mo Kio at S$130-S$180 per unit. Fan motor, blower, coil and drain pan cleaned part by part. Fixed quote, 90-day warranty.

URL: https://airconservicingangmokio.com/chemical-overhaul/

Ang Mo Kio · Cool Earth Aircon

# Aircon Chemical Overhaul in Ang Mo Kio: Full Dismantle and Clean

Last updated: 11 November 2026

The indoor unit is taken apart and the fan motor, blower wheel, coil, drain pan and housing are cleaned one by one. S$130 to S$180 per unit, quoted before work, with a 90-day workmanship warranty.

-   Full dismantle of the indoor unit
-   Fan motor, blower wheel, coil, drain pan and housing cleaned one by one
-   Parts checked for wear; any worn part quoted before work
-   Reassembled and tested for airflow, temperature and drainage

WhatsApp for a Fixed Quote

[https://wa.me/6594273833?text=Hi%2C%20I'd%20like%20a%20fixed%20quote%20for%20aircon%20chemical%20overhaul%20in%20Ang%20Mo%20Kio. →](https://wa.me/6594273833?text=Hi%2C%20I'd%20like%20a%20fixed%20quote%20for%20aircon%20chemical%20overhaul%20in%20Ang%20Mo%20Kio.)

 

+65 9427 3833

[tel:+6594273833 →](tel:+6594273833)

![Technician dismantling an indoor aircon unit in an older Ang Mo Kio HDB flat for a chemical overhaul](/images/misc/technician-dismantling-indoor-aircon-unit-on-floor.webp)

Chemical Overhaul

S$130 to S$180

per unit

**4.0/5** 66 Google reviews (Cool Earth Aircon)

**Same-day slots** usual arrival within 90 min, subject to availability

**4,560+** units serviced since 2007

**90-day** workmanship warranty

## What Is an Aircon Chemical Overhaul?

Does your aircon still smell sour, even straight after a service? That’s usually the moment an aircon chemical overhaul is worth a look.

Aircon Servicing Ang Mo Kio is the local service of Cool Earth Aircon, which Brian started in 2007 as a one-man workshop. Since then, one pattern has held true: the worst grime hides where a quick wipe can’t reach.

An aircon chemical overhaul is the deepest clean a unit can get. The technician takes the fan coil unit apart on site and works through it part by part. Each one is cleaned, checked for wear, put back together and tested.

-   **Fan motor:** checked for grinding or wear
-   **Blower wheel:** where mould cakes between the blades
-   **Evaporator coil:** cleaned of the film that blocks cooling
-   **Drain pan:** where sludge packs into the corners
-   **Housing:** cleaned and refitted

It goes further than a 

chemical wash

[/chemical-wash/ →](/chemical-wash/)

, where the unit stays on the wall. Once the parts are out, we can reach the sludge in the drain pan and the mould on the blower wheel. Parts that can be soaked go into a chemical immersion to loosen what brushing alone will not shift.

Two Singapore guides show how the jobs differ. Helpling puts a wash at 1 to 2 hours per unit, every 6 to 12 months, and an overhaul at 3 to 5 hours, every 3 to 5 years. Billy Aircon describes a wash as partial dismantling, with only the front panel off. Exact timings vary by company and unit, so ask us when you book.

|  | Chemical wash | Chemical overhaul |
| --- | --- | --- |
| How much comes apart | Front panel and easy-to-reach parts | Whole fan coil unit, every part cleaned |
| Typical time per unit | 1 to 2 hours | 3 to 5 hours |
| Suggested frequency | Every 6 to 12 months | Every 3 to 5 years |

![Aircon blower wheel and drain pan laid out on a mat during a chemical overhaul in an HDB flat](/images/content/dismantled-aircon-parts-blower-wheel-fan-motor-and.webp)

## When Is an Overhaul the Right Job?

An overhaul makes sense when normal servicing no longer brings the cooling back. Book one when:

-   There is a strong sour smell every time the unit runs
-   Black mould or dark flecks blow out of the vents
-   Jelly sludge sits in the drain pan or keeps choking the drain
-   The unit is older than 5 years and has never had a deep clean
-   The unit has gone more than a year without any service

As a rule of thumb, both Helpling and Billy Aircon suggest an overhaul every 3 to 5 years, with a wash in between. Billy Aircon also points out that if a unit still smells or leaks after a wash, the problem is sitting deeper inside.

If the smell is mild and cooling is only a little weak, a chemical wash from S$80 per unit is usually enough. Not sure which one fits? WhatsApp a photo of the vents and we’ll tell you before you book.

Got 2 to 4 units at home? You don’t have to overhaul them all at once. Send a photo of each unit’s vents, and we’ll say which ones really need it.

## Why Does Build-Up Get This Bad?

Aircon units in Singapore run almost every day, and the air they pull in is wet. The Meteorological Service Singapore puts mean annual relative humidity at around 82%. It sits above 90% just before sunrise and only drops to about 60% on dry afternoons.

Here’s what that does inside your unit:

1.  Moisture from the coil drips into the drain pan.
2.  Dust and mould spores settle in that wet tray.
3.  Over time, the mix turns into a thick, jelly-like sludge.
4.  The sludge slows drainage, feeds the mould on the blower wheel, and pushes a sour smell into the room.

iCare Aircon, a Singapore installer, describes this sludge as algae and bacteria mixing with household dust. Once it reaches that stage, washing from the outside only clears the surface.

## Older HDB Blocks in Ang Mo Kio

Many HDB flat blocks in 

Teck Ghee, Cheng San, Chong Boon and Kebun Bahru

[/areas/teck-ghee-cheng-san/ →](/areas/teck-ghee-cheng-san/)

 were built in the late 1970s and 1980s. HDB’s Ang Mo Kio Town Design Guide, completed in 2024, dates the town’s first slab blocks to 1973. By the early 1980s, the town centre covered 29 hectares.

A lot of these homes still run older units, some of them non-inverter systems on R22 refrigerant, with old copper piping behind them. R22 is being phased out, and Coogle Aircon says supply is limited while costs keep rising. That makes a proper inspection worth doing before you spend more on an old unit.

Older blocks along Ang Mo Kio Avenue 3 and Avenue 10 often need an overhaul when routine servicing no longer restores the cooling. While the unit is open, we also check the pipe insulation and the drain connection, since worn insulation on old piping is a common source of drips.

## Common Problems We Solve

### Strong sour smell

A sour smell points to sludge and mould deep inside the unit, usually in the drain pan and on the blower wheel. Taking those parts out and cleaning them is what removes the source.

### Black mould blowing out

When dark specks land on the bed or the wall below the unit, the blower wheel is shedding mould as it spins. Each blade needs a proper clean, which is only possible once the wheel is out.

### Jelly sludge in the drain pan

Sludge blocks drainage and causes overflow onto walls and floors. The pan is removed, soaked and scrubbed so the water can drain freely again.

Installers such as iCare Aircon describe pulling large sludge clogs out of the standard 13mm or 16mm PVC drain pipes. For leaks with other causes, see 

water leak repair

[/aircon-water-leak-repair/ →](/aircon-water-leak-repair/)

.

### Severe loss of cooling

If a unit barely cools even after servicing, a heavily coated coil and a clogged blower wheel are common causes. When the overhaul does not bring the cooling back, the next step is to check refrigerant and parts through 

not cold repair

[/aircon-not-cold-repair/ →](/aircon-not-cold-repair/)

.

## Is a Worn Part Found Along the Way?

Because every part comes out, the overhaul is a good moment to spot wear. Here’s what we look out for:

-   A fan motor that has started to grind
-   A cracked drain pan
-   Worn pipe insulation on older copper piping

Billy Aircon suggests getting a unit that makes loud mechanical noises inspected, as it may need an overhaul. Anything worn is shown to you and quoted before work. Nothing is replaced without your go-ahead.

A Mitsubishi Electric unit, a Daikin unit or an unbranded older unit all get the same check. For replacement units, enquiries go to Cool Earth Aircon at 

coolearth.com.sg

[https://www.coolearth.com.sg →](https://www.coolearth.com.sg)

.

## After the Overhaul

An overhauled unit starts clean, but the same humid air keeps passing through it every day. To stop the sludge and mould from building up again, book 

general servicing

[/ →](/)

 every 3 to 4 months. Alvaircon calls this the general rule of thumb for Singapore homes.

Each visit covers three jobs:

-   Cleans the filters
-   Checks the coil
-   Flushes the drain line, which is where the trouble starts

Manufacturer manuals often assume a 4 to 6 month gap, but aircons.sg says debris builds up 2 to 3 times faster in Singapore’s climate. That’s why shorter gaps pay off.

If remembering to book is the hard part, an 

annual maintenance contract

[/maintenance-contract/ →](/maintenance-contract/)

 schedules four visits a year with priority booking. Our guide on 

how often to service your aircon

[/guide/how-often-to-service-aircon/ →](/guide/how-often-to-service-aircon/)

 explains why that interval suits units in Singapore homes.

Ready to book an aircon chemical overhaul, or still comparing? See the full 

price list

[/pricing/ →](/pricing/)

 to compare the overhaul with other services, then WhatsApp us a photo of your vents to get started.

Pricing

## How much does chemical overhaul cost in Ang Mo Kio?

Range depends on unit type and condition. Any worn part is quoted before work.

### Chemical Wash

Unit stays on the wall. For weak cooling or a mild smell.

From S$80 per unit

-   Coil, blower wheel and drain parts washed
-   Each unit tested after
-   90-day workmanship warranty

Recommended

### Chemical Overhaul

Full dismantle for heavy mould, sludge or a strong smell.

S$130 to S$180 per unit

-   Indoor unit taken apart
-   Fan motor, blower, coil, drain pan and housing cleaned
-   Parts checked for wear
-   Tested for airflow, temperature and drainage
-   90-day workmanship warranty

Fixed quote before work · No callout fee · Pay after the job · 90-day workmanship warranty. 

See the full price list

[/pricing/ →](/pricing/)

Why choose us

## Why choose Aircon Servicing Ang Mo Kio for chemical overhaul?

### Price range told up front

S$130 to S$180 per unit, with the exact figure confirmed before work. No callout fee.

### Worn parts flagged, not swapped

If a part is worn, you see it and get a quote first. Nothing is replaced without your go-ahead.

### Used to older HDB units

Overhauls are a common job in the older blocks of Teck Ghee, Cheng San, Chong Boon and Kebun Bahru.

### 90-day warranty

If the same fault comes back within 90 days, the team returns and fixes it at no extra charge.

### Open 7 days

Monday to Saturday 9 AM to 9 PM, Sunday 9 AM to 8 PM.

Process

## How does our chemical overhaul work?

1.  1
    
    ### Tell us the symptoms
    
    WhatsApp the number of units, what you see or smell, and roughly when the units were last serviced.
    
2.  2
    
    ### Fixed quote
    
    You get a price within S$130 to S$180 per unit and choose a slot, including evenings and Sundays.
    
3.  3
    
    ### Dismantle
    
    The technician checks the unit, confirms the work, protects the area and takes the indoor unit apart.
    
4.  4
    
    ### Clean part by part
    
    The fan motor, blower wheel, coil, drain pan and housing are cleaned one by one and checked for wear.
    
5.  5
    
    ### Reassemble and test
    
    The unit is put back together and tested for airflow, temperature and drainage. You pay after the job.
    

Our work

## Chemical Overhaul jobs in Ang Mo Kio

Tap a photo to see it larger.

 

Reviews

## What customers say

Cool Earth Aircon holds a 4.0 Google rating from 66 reviews.

4.0/5on Google

> "The bedroom unit smelled sour for months. After the overhaul the smell is gone and it cools properly again. He showed me the sludge in the drain pan."

RRavi K.Cheng San

> "Three units in our Teck Ghee flat, done in one evening after work. The price on WhatsApp was the price I paid."

MMei Ling T.Teck Ghee

> "Water was dripping onto the bed. They came the same afternoon, cleared the drain line and tested it before leaving."

JJason L.Kebun Bahru

FAQ

## Chemical Overhaul FAQs

### How much is a chemical overhaul in Ang Mo Kio?

A chemical overhaul is S$130 to S$180 per unit. Where a unit falls in that range depends on its type and how dirty it is. A wall-mounted bedroom unit with moderate build-up sits at the lower end, while a heavily soiled unit with sludge in the drain pan takes longer and sits higher. The technician checks each unit and confirms the price before starting. There is no callout fee, payment is made after the job, and the work carries a 90-day workmanship warranty. If a worn part is found during the dismantle, such as a tired fan motor, it is shown to you and quoted separately before anything is replaced.

### Chemical wash or chemical overhaul: which do I need?

A chemical wash, from S$80 per unit, cleans the coil, blower wheel and drain parts with the unit still on the wall. It suits weak cooling and a mild musty smell. A chemical overhaul takes the unit apart so every part can be cleaned properly. Choose an overhaul when there is a strong sour smell, black mould blowing out of the vents, jelly-like sludge in the drain pan, severe loss of cooling, or a unit older than 5 years that has never had a deep clean. If you are not sure, send a photo of the vents and drain pan on WhatsApp and the technician will tell you which job fits before you book.

### What happens to my aircon during an overhaul?

The technician protects the floor and wall, then takes the indoor unit apart. The front panel, filters, blower wheel, fan motor, drain pan and housing come out. Parts that can be soaked go into a chemical immersion to loosen sludge and mould, while the evaporator coil is cleaned in place. Each part is rinsed, dried and checked for wear. The copper piping connections and pipe insulation are checked while the unit is open. The unit is then reassembled and tested for airflow, cold air temperature and drainage. The area is cleaned up before the technician leaves, and the 90-day workmanship warranty starts once you pay.

### How long does a chemical overhaul take?

An overhaul takes longer than a wash, as the unit is fully taken apart and put back together. Heavily soiled units take longer still. The technician gives a time estimate per unit when the job is confirmed.

### Is an overhaul worth it for an old unit?

Often, yes. Many older units lose cooling because of dirt, not a failed part. An overhaul removes that build-up and shows whether any part is worn. If a unit is beyond repair, replacement enquiries go to Cool Earth Aircon at coolearth.com.sg.

### Can you overhaul units that still use R22 gas?

Yes. Older non-inverter units that run on R22 refrigerant can be overhauled. The refrigerant circuit is not opened during an overhaul. If the pressure check shows low gas, a top-up is quoted separately.

### Will an overhaul stop my aircon leaking?

If the leak comes from sludge choking the drain pan or drain line, yes, as both are cleaned out. If the cause is a cracked pan or worn pipe insulation, that is found during the overhaul and quoted before repair.

### Do I need to be at home?

Someone should be there to let the technician in, confirm the work before it starts and check the unit at the end. You do not need to watch the whole job.

### How often does a unit need an overhaul?

Not often if it is serviced every 3 to 4 months. Most overhauls are for units that missed servicing for a year or more, or older units with years of build-up.

Related guides

## Read before you book

![Close view of a dusty aircon filter pulled from a wall-mounted unit in an HDB bedroom](/images/featured/close-view-of-a-dusty-aircon-filter-pulled-from-a-.webp)

Guide · 4 min read

### Signs Your Aircon Needs Servicing

Weak airflow, dusty filters, slow cooling or a light musty smell? The signs your aircon is due for servicing, and when it needs more than that.

Read guide

[Signs Your Aircon Needs Servicing →](/guide/signs-your-aircon-needs-servicing/)

![Technician on a step ladder servicing a wall-mounted aircon in a Singapore HDB living room](/images/featured/technician-on-a-step-ladder-servicing-a-wall-mount.webp)

Guide · 4 min read

### How Often Should You Service Your Aircon in a Singapore Home?

For daily-use units in hot, humid Singapore, service every 3 to 4 months. What changes the interval and how a contract keeps you on schedule.

Read guide

[How Often Should You Service Your Aircon in a Singapore Home? →](/guide/how-often-to-service-aircon/)

Related services

## You might also need

 

![Aircon fins being rinsed during a chemical wash in a Singapore flat](/images/cards/close-view-of-mouldy-aircon-fins-being-rinsed-with.webp) Deep clean on the wall

### Aircon Chemical Wash

On-the-wall deep clean of the evaporator coil, blower wheel and drain parts for units that still cool poorly or smell after normal servicing.

From S$80 Details

[Aircon Chemical Wash →](/chemical-wash/)

![Technician flushing a choked aircon drain line](/images/cards/technician-flushing-choked-aircon-condensate-drain.webp)

### Aircon Water Leak Repair

Clears choked drain lines and fixes drain pan and pipe faults that cause the indoor unit to drip.

From S$60 Details

[Aircon Water Leak Repair →](/aircon-water-leak-repair/)

![Homeowner in a warm room under an aircon that is not cooling](/images/cards/homeowner-fanning-herself-under-wall-mounted-airco.webp)

### Aircon Not Cold Repair

Finds and fixes the cause of weak or warm air: dirty coils, low refrigerant, a failed part or an outdoor unit that is not running.

From S$60 Details

[Aircon Not Cold Repair →](/aircon-not-cold-repair/)

Same-day slots, subject to availability

## Ready to book chemical overhaul?

Send the number of units and your Ang Mo Kio address. You get a fixed price for aircon chemical overhaul before any work starts.

Direct WhatsApp +65 9427 3833

[https://wa.me/6594273833?text=Hi%2C%20I'd%20like%20a%20fixed%20quote%20for%20aircon%20servicing%20in%20Ang%20Mo%20Kio. →](https://wa.me/6594273833?text=Hi%2C%20I'd%20like%20a%20fixed%20quote%20for%20aircon%20servicing%20in%20Ang%20Mo%20Kio.)

 

Call us +65 9427 3833 · Office +65 6810 6706

[tel:+6594273833 →](tel:+6594273833)

Open 7 days Mon to Sat 9 AM to 9 PM · Sun 9 AM to 8 PM

### Quick quote request