An aircon chemical overhaul is the deepest cleaning service available. The indoor fan coil unit is fully dismantled — fan blower, drain tray, casing, electrical components — and each part is cleaned individually with specialised chemicals. This catches issues that even a chemical wash cannot reach: PCB corrosion, fan blade grime, hidden mould inside the casing, and accumulated debris in cavities.
Aircon Chemical Overhaul
| Number of Units | Price (incl. GST) | Per Unit |
|---|---|---|
| 1 unit | $200 | $200.00 / unit |
| 2 units | $370 | $185.00 / unit |
| 3 units | $515 | $171.67 / unit |
| 4 units | $640 | $160.00 / unit |
| 5+ units | $150 per unit | |
What's included
- 9-point pre-check (included with service booking, $45 min for 1 unit)
- Full disassembly of indoor fan coil unit
- Individual chemical cleaning of every component
- Coil deep treatment with anti-bacterial solution
- Fan blower wheel cleaned and balanced
- PCB inspection and dust removal
- Anti-rust coating on metal components
- Drain tray and pipe pressure-cleaned
- Full reassembly and 5-point performance test
Signs your aircon needs an overhaul, not just a wash
A chemical wash cleans the coil in place and handles most deep-cleaning needs. An overhaul is the right call when the problem is deeper than the coil, or when a wash alone no longer brings the unit back. In Singapore's humidity, units that have run for years without a strip-down often hide grime in places a wash cannot reach.
- The musty smell or weak cooling came back soon after a chemical wash
- The unit is more than 5 years old and has never been overhauled
- Heavy mould or thick grime is visible on the blower wheel or inside the casing
- Cooling has dropped noticeably and a wash made little difference
- Water keeps overflowing despite drainage cleaning (debris deep in the tray)
- You are refreshing a unit before renting out or moving into a property
Chemical overhaul vs chemical wash — the honest difference
Both use cleaning chemicals, but the depth is very different — and being sold an overhaul when a wash would do is a common way to overpay.
A chemical wash (from $135 for 1 unit) cleans the evaporator coil and drainage without taking the unit apart — ideal every 6 to 12 months. A chemical overhaul (from $200 for 1 unit) fully dismantles the indoor fan coil: the blower wheel, drain tray, casing and electrical board are each removed and cleaned individually, then anti-rust treated and reassembled. It reaches grime, PCB dust and hidden mould a wash physically cannot.
Our 9-point pre-check tells you honestly which one your unit actually needs — we will not strip a unit that only needs a wash.
What a full chemical overhaul includes, step by step
- 9-point pre-check to confirm an overhaul is genuinely needed.
- The indoor fan coil unit is fully dismantled — blower, drain tray, casing and covers removed.
- Every component is cleaned individually with specialised chemicals, not just rinsed in place.
- The blower wheel is cleaned and re-balanced so airflow and noise return to normal.
- The PCB and electrical parts are inspected and dust-cleared.
- Anti-rust coating is applied to metal components to slow future corrosion.
- The drain tray and pipe are pressure-cleaned and treated.
- Full reassembly, then a 5-point performance test before we leave.
How often should you do a chemical overhaul?
For most homes, every 2 to 3 years is right — with routine 3-monthly servicing and a chemical wash every 6 to 12 months in between. Units that run heavily, sit in dusty environments, or are already 5+ years old benefit from an overhaul sooner.
If a recent chemical wash did not fix weak cooling or a returning smell, that is usually the sign the unit has reached overhaul territory rather than needing another wash.
Chemical overhaul pricing in Singapore — no GST
Our chemical overhaul is $200 for 1 unit, $370 for 2, $515 for 3 and $640 for 4 units. A typical 3-bedroom HDB flat with 3 fan coil units is $515; a 4-bedroom with 4 units is $640.
There is no GST — the quoted figure is final. Every overhaul includes the 9-point pre-check, full disassembly and individual component cleaning, anti-rust treatment, and a 90-day workmanship warranty. If we find a part that genuinely needs replacing, we quote it transparently before doing anything.
Will an overhaul make an old aircon work like new?
For units under about 8 years old in sound mechanical condition, an overhaul restores most of the original cooling and airflow — it is the most thorough clean short of replacement. Older units, or those with a tired compressor, will improve clearly but may not fully recover their original specs.
If the pre-check shows the unit is near end-of-life, we will tell you honestly — sometimes a new installation is the smarter spend than overhauling a unit on its way out.
✅ Good for
- Aircon over 5 years old without prior overhaul
- Units with persistent issues despite chemical wash
- Heavy mould infestation or strong odour
- Units showing reduced cooling after chemical wash
- Pre-rental property aircon refresh
Recent chemical overhaul jobs
Frequently asked questions
Chemical wash vs chemical overhaul — which do I need?
How much does a full HDB aircon overhaul cost?
Will chemical overhaul make my aircon work like new?
How long does a chemical overhaul take?
Is a chemical overhaul worth it for an older aircon?
Do you need to remove the unit from the wall?
My aircon still smells after a chemical wash — will an overhaul fix it?
Other aircon services we offer
- Aircon Servicing — from $25/unit
- Aircon Chemical Wash — from $100/unit
- Aircon Repair & Gas Top-Up — from $45 incl. pre-check
- Aircon Installation — from $1,200