# Aircon Chemical Overhaul Serangoon S$130-S$180 | Fixed Quote

> Aircon chemical overhaul in Serangoon at S$130-S$180 per unit. Indoor unit dismantled, every part cleaned and checked. Fixed quote, 90-day warranty. WhatsApp us.

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

Common in older flats

# Aircon Chemical Overhaul in Serangoon: Full Dismantle and Deep Clean

Last updated: 11 November 2026

The indoor unit is taken apart and each part is cleaned, checked for wear and rebuilt, for heavy mould, strong smells and long-neglected units.

-   No callout fee
-   Pay after the job
-   90-day warranty

WhatsApp for a Fixed Quote

[https://wa.me/6594273833 →](https://wa.me/6594273833)

 

See Prices

[#pricing →](#pricing)

Or call 

+65 9427 3833

[tel:+6594273833 →](tel:+6594273833)

 | Mon-Sat 9am-9pm, Sun 9am-8pm

![A wall-mounted aircon fully dismantled for a chemical overhaul, with parts laid out on a plastic sheet in a Serangoon flat](/images/misc/indoor-aircon-unit-fully-dismantled-on-plastic-she.webp)

90-Day

Workmanship Warranty

Price

S$130-S$180 per unit

2007

Serving Singapore Since

4,560+

Units Serviced

90-Day

Workmanship Warranty

7 Days

Until 9pm Mon-Sat

Cool Earth Aircon: 4.0 on Google (66 reviews) | 380+ jobs a month across Cool Earth Aircon

## What Is an Aircon Chemical Overhaul?

Ever switched on your aircon and caught a sour smell? Mould is usually behind it, and a quick spray rarely reaches it.

An aircon chemical overhaul is our deepest clean. We take the indoor unit apart, then clean the **fan motor**, **blower wheel**, **evaporator coil**, **drain pan** and housing one by one. Each part is checked for wear, put back together and tested.

Aircon Servicing Serangoon is the local arm of Cool Earth Aircon, which Brian started in 2007 as a one-man workshop. The coil usually stays on the **wall backplate** and is rinsed there, while the other parts are cleaned on a sheet on the floor.

This is different from a 

chemical wash

[/chemical-wash/ →](/chemical-wash/)

, where the unit stays on the wall and cleaner is flushed through it. A wash reaches a lot, but it cannot reach mould packed behind the blower wheel or **jelly sludge** stuck to the corners of the drain pan. Taking the unit apart is the only way to get all of it out.

Here is what you get with every overhaul:

-   **S$130 to S$180 per unit**, fixed before work starts
-   **No callout fee** for Serangoon
-   **90-day workmanship warranty** on the work

## Why Overhauls Are Common in Serangoon

Many homes in Serangoon Central and Serangoon North are **1980s HDB flats**. According to PropertyGuru, construction on Serangoon North Avenue 1 began in 1984, and the estate was fully on sale by 1988. A lot of these flats run older units that have only ever had basic servicing.

Singapore’s humidity sits between 70% and 90%, according to Pico Mould Removal. That keeps a coil damp, and mould settles in places a normal service never reaches. In Serangoon Garden landed homes, units in spare rooms often sit unused for months, then smell sour when they are switched back on.

That is why the chemical overhaul is one of our most common jobs here. You can read more about the local pattern on our 

Serangoon Central

[/areas/central/ →](/areas/central/)

 and 

Serangoon Garden

[/areas/garden/ →](/areas/garden/)

 area pages.

## Signs Your Aircon Needs an Overhaul

-   **A strong sour smell** that does not fade after a few minutes
-   **Black mould blowing out** of the air outlet, sometimes as small specks
-   **Jelly-like sludge in the drain pan**, often with repeat leaks
-   **Severe loss of cooling**, even after a normal service
-   **No service for more than a year**, or a unit over 5 years old with no deep clean

Coogle Aircon puts the usual chemical wash interval in Singapore at 12 to 18 months. A unit that has gone past that with no deep clean is a likely candidate.

Our technician always opens the unit and shows you what is inside before starting. If a chemical wash will do the job, we will say so.

## Common Problems an Overhaul Solves

### Black mould on the blower wheel

The blower wheel is a long drum of curved blades. Mould packs into the gaps and a spray-and-rinse cannot shift it. With the wheel out, we clean each blade until it is bare.

### Sludge that keeps choking the drain

Old drain pans collect a jelly of slime and dust. It washes into the drain line and blocks it, so water spills out of the unit. Billy Aircon notes that algae and mould grow quickly in the dark, damp drip pan, so scrubbing the pan stops the source of the blockage.

### Sour smell in a rarely used room

Units that sit unused stay damp inside, and mould grows fast. The site aircons.sg says mould, algae and bacteria can colonise the coil fins and drain pan within weeks in Singapore’s climate.

An overhaul clears the growth, so the room smells normal when the unit runs.

### Bent fins and worn parts

With the cover off, our technician can do **fin straightening** on bent coil fins and check the fan motor and **flare connections**. Any worn part is pointed out and quoted before replacement.

## Chemical Wash or Chemical Overhaul?

|  | Chemical Wash | Chemical Overhaul |
| --- | --- | --- |
| Unit taken apart | No | Yes |
| Reaches packed mould | Partly | Fully |
| Best for | Weak cooling, mild smell | Heavy mould, sour smell, sludge |
| Price | From S$80 per unit | S$130-S$180 per unit |

For context, Helpling’s Singapore guide lists overhauls at S$150 to S$250 per unit across the market. It also says they take 3 to 5 hours, against 1 to 2 hours for a wash.

Got 2 to 4 units? Ask for a time estimate when you book, so you can plan your day around it.

## Looking After the Unit After an Overhaul

Once the unit is clean, keep it that way with 

general servicing every 3 to 4 months

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

. The site aircons.sg also recommends quarterly servicing for most Singapore homes. Run the fan mode for a few minutes before switching off at night to help the coil dry.

For homes with many units, our 

servicing contract

[/contract/ →](/contract/)

 is often cheaper than booking each visit separately.

If your aircon smells sour or leaks, an aircon chemical overhaul is the fix that gets to the root. Message us to book, and we will fix the price before any work starts.

Published Prices

## How Much Does Chemical Overhaul Cost in Serangoon?

S$130-S$180 per unit. Depends on unit type and condition. Fixed quote before work. No callout fee for Serangoon. Pay after the job.

### Chemical Wash

per unit, unit stays on the wall

From S$80

-   Coil and blower chemical clean
-   Drain pan and line flush
-   For weak cooling and mild smells

Book Now

[https://wa.me/6594273833 →](https://wa.me/6594273833)

This service

### Chemical Overhaul

per unit

S$130-S$180

-   Full dismantle
-   Fan motor, blower wheel, coil, drain pan and housing cleaned
-   Wear check before reassembly
-   Leak check and cooling test
-   90-day warranty

Book Now

[https://wa.me/6594273833 →](https://wa.me/6594273833)

Compare every service on our 

full aircon price list

[/aircon-servicing-price/ →](/aircon-servicing-price/)

.

Why Choose Us

## Why Choose Aircon Servicing Serangoon for Chemical Overhaul?

### We Show You First

You see the mould or sludge before we start, so you know why an overhaul is needed.

### Wear Check Included

Fan motor, blower wheel and drain pan are checked for wear while they are out of the unit.

### Used to Older Units

Many 1980s HDB flats in Serangoon run older units. We see these jobs every week.

### Fixed Price Range

S$130-S$180 per unit, fixed before work. No callout fee, no extras on the day.

### 90-Day Warranty

If the same fault returns within 90 days, we come back and fix it at no extra charge.

### Clean Workspace

We work on sheets, keep parts organised and clean up before we leave.

The Process

## How Does Chemical Overhaul Work?

The technician confirms the work and the price with you before starting. You pay after the job.

1.  1
    
    ### WhatsApp Us
    
    Tell us the units, the symptoms and your Serangoon address. Photos of the air outlet help.
    
2.  2
    
    ### Fixed Quote
    
    We quote S$130-S$180 per unit depending on type and condition, then book your slot.
    
3.  3
    
    ### Inspect and Confirm
    
    The technician opens the unit, shows you the mould or sludge and confirms the overhaul before starting.
    
4.  4
    
    ### Dismantle and Clean
    
    Parts come off and are cleaned one by one. The PCB is protected and the coil is rinsed on the backplate.
    
5.  5
    
    ### Rebuild and Test
    
    Reassembly, leak check and cooling test. You pay after the job and the 90-day warranty starts.
    

## Not sure if you need a service, a wash or a repair?

Tell us what the unit is doing. We will tell you what it probably needs and give you a fixed quote before anyone picks up a tool.

WhatsApp Us

[https://wa.me/6594273833 →](https://wa.me/6594273833)

 

+65 9427 3833

[tel:+6594273833 →](tel:+6594273833)

On the Job

## Inside a Chemical Overhaul

Click any photo to see it larger.

Reviews

## What Serangoon Customers Say

Cool Earth Aircon: 4.0 on Google (66 reviews). We are part of Cool Earth Aircon, servicing Singapore homes since 2007.

**4.0** on Google (66 reviews, Cool Earth Aircon)

> "Told me the price on WhatsApp before coming. Serviced 3 units in our Serangoon Central flat, cleaned up after and tested each one. No extra charges."

M

Mei Ling T.

Serangoon Central

> "Bedroom unit kept leaking onto the wall. The technician cleared a choked drain line and showed me the sludge. No more dripping since."

R

Ravi K.

Serangoon North

> "Had a chemical overhaul on two old units in our Serangoon Garden house. The sour smell is gone and the rooms cool much faster."

D

Daniel O.

Serangoon Garden

Got Questions?

## Chemical Overhaul FAQs

### How much is an aircon chemical overhaul in Serangoon?

S$130 to S$180 per unit, depending on the unit type and condition. You get a fixed quote before any work starts and there is no callout fee for Serangoon.

### What is the difference between a chemical wash and a chemical overhaul?

In a chemical wash the unit stays on the wall and the coil, blower wheel and drain parts are chemically cleaned and flushed. In an overhaul the unit is taken apart and every part is cleaned by hand, checked for wear and rebuilt. Overhauls are for heavy mould, sour smells and units with no service for over a year.

### How do I know my aircon needs an overhaul?

A strong sour smell, black mould blowing out, jelly-like sludge in the drain pan, severe loss of cooling, or a unit over 5 years old that has never had a deep clean are the usual signs. The technician confirms what they find before starting.

### How long does a chemical overhaul take?

It takes longer than a wash because each part is taken out, cleaned and rebuilt. The time depends on the unit type and how dirty it is. The technician confirms the expected time with your fixed quote.

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

Often, yes, if the compressor and electrics are still healthy and the main problem is dirt and mould. If a unit has major faults as well, we will tell you before you pay. For replacement, contact our parent company Cool Earth Aircon at coolearth.com.sg.

### Do you overhaul R22 units?

Yes. Many older units in Serangoon run on R22. The overhaul is a cleaning job, so the refrigerant type does not stop us cleaning the indoor unit.

### Will the overhaul fix my leak?

If the leak is caused by sludge in the drain pan or a choked drain line, yes, because both are cleaned. If it is a pipe fault, we will quote that repair separately before doing it.

### Is the circuit board protected during the overhaul?

Yes. The PCB and electrical parts are removed or covered before any water or cleaner is used.

### Do I need to move furniture?

Please clear the area under the indoor unit and leave a small space nearby for the parts. We bring sheets to protect the floor and wall.

### Still have a question?

Send us a WhatsApp with your units and the problem. We reply with a fixed quote.

Chat on WhatsApp

[https://wa.me/6594273833 →](https://wa.me/6594273833)

## Related Services

### Aircon Chemical Wash

Deep clean of the coil, blower wheel and drain parts with the indoor unit left on the wall, for weak cooling and mild smells.

From S$80 per unit

View service

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

### Aircon Water Leak Repair

Clears choked drain lines and fixes drain pan and pipe faults that cause dripping.

From S$60

View service

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

### Aircon Not Cold Repair

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

From S$60

View service

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

### Aircon Repair

Diagnosis and repair for breakdowns of all kinds, with same-day emergency slots, for all common brands, inverter and non-inverter.

From S$60

View service

[Aircon Repair →](/aircon-repair/)

Same-day slots in Serangoon, subject to availability

## Ready to Book Chemical Overhaul?

Send your units, the problem and your Serangoon address. We reply with a fixed quote for aircon chemical overhaul. No callout fee, 90-day workmanship warranty.

WhatsApp (fastest reply) +65 9427 3833

[https://wa.me/6594273833 →](https://wa.me/6594273833)

 

Call us +65 9427 3833 or +65 6810 6706

[tel:+6594273833 →](tel:+6594273833)

Open 7 days Mon-Sat 9am-9pm, Sun 9am-8pm

WhatsApp for a Fixed Quote

[https://wa.me/6594273833 →](https://wa.me/6594273833)

 

See All Prices

[/aircon-servicing-price/ →](/aircon-servicing-price/)

-   Fixed quote first
-   No callout fee
-   Pay after the job
-   90-day workmanship warranty