# Chemical Wash vs Chemical Overhaul Singapore: Difference and Price | AirconList

> Aircon chemical wash vs chemical overhaul in Singapore: what each involves, how often, published prices per unit, and how to tell which your unit needs.

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Decision guide 

# Aircon Chemical Wash vs Chemical Overhaul: Which Do You Need?

Updated 2026-10-11 · AirconList 

 Short answer: A chemical wash partially dismantles the indoor unit to clean the coil, blower and drain tray, every 6 to 12 months, for about S$80 to S$120 a unit. A chemical overhaul fully dismantles the indoor and outdoor units, cleans each part and checks worn parts, every 3 to 5 years, for about S$150 to S$250 a unit (S$350 for ceiling units at one provider). 

## The difference in one table

From Helpling’s February 2026 guide ([Helpling](https://www.helpling.com.sg/?p=2458)): 

 Chemical wash Chemical overhaul 
 What happens Partial disassembly of the indoor unit to reach the coils, blower wheel and drainage Complete dismantling of indoor and outdoor units; each component cleaned separately 
 Parts Not replaced Worn parts such as capacitors, bearings and gaskets inspected and replaced 
 How often Every 6 to 12 months Every 3 to 5 years 
 Price per unit S$80 to S$120 S$150 to S$250 

Helpling’s own price list is more specific: wash S$80 (9k to 18k BTU) or S$100 (24k BTU); overhaul S$160 , S$180 and S$350 for a ceiling unit ([Helpling price list](https://www.helpling.com.sg/aircon-services)). 

## Which one you need

- Serviced regularly, cooling fine, a little smell: a chemical wash.

- Not serviced for over a year, heavy dirt, smells or leaks that keep coming back: an overhaul.

- Not sure: ask the technician to open the front panel and show you the coil before choosing.

[Compare companies for chemical washes](/service/chemical-wash/) or [estimate the cost](/tools/aircon-cost-estimator/). 

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An aircon company will call you on the number you gave. If water is dripping near a socket, switch that aircon off until it is checked. 

## More questions

 Is an overhaul always better? + 
No. For a regularly serviced unit, a wash is usually enough. An overhaul suits units with heavy build-up or that have gone more than a year without servicing. Does a chemical wash include a gas top-up? + 
Not as standard. Ask the company: some packages include a check or a partial top-up. [Find a companyChemical wash8 companies listed](/service/chemical-wash/) 

More guides 
- Aircon Leaking Water? Causes and Fixes for Singapore Homes
- Aircon Not Cold? What to Check Before Calling Anyone
- How Much Does Aircon Servicing Cost in Singapore?
- How Often Should You Service Your Aircon in Singapore?
- How to Choose an Aircon Servicing Company in Singapore 

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