Aircon chemical overhaul Singapore. The deepest clean possible.
An aircon chemical overhaul Singapore homeowners trust when nothing else works. Your fan coil is fully removed from the wall, every component is dismantled, chemical-washed and pressure-jet rinsed individually. $100 to $150 per unit with a free gas top-up if needed.
✓ Free gas top-up if needed ✓ BizSafe 3 certified ✓ 20+ technicians ✓ 22,000+ customers since 2016
Where Overhaul Sits
The 3 levels of aircon deep cleaning
Most homes only ever need general servicing. Step up to chemical wash or chemical overhaul
only when the level below it can't fix the problem.
When You Actually Need It
Signs you need a chemical overhaul
If you've already done a chemical wash and the problem came back, or your unit is in any of these states, an overhaul is the right move.
Leaks even after chemical wash
If the drainage is still backing up after a chemical wash, the bio-jelly is hardened deep inside. Only full disassembly clears it.
Mould keeps coming back
Mould trapped in the rear of the heat exchanger and casing seams can't be reached without removing the whole unit. Overhaul is the only fix.
Weak cooling despite gas top-up
If gas levels are fine but cooling is still poor, the coil is so clogged that airflow is choked off. Overhaul restores it.
Unit is 5+ years old
Old units that have never had an overhaul accumulate years of compacted grime. A single overhaul can extend life by several years.
Persistent musty smell
If the smell returns within weeks of a chemical wash, the source is inside parts that can only be cleaned by removing them.
Considering replacement
Before spending $1,500+ on a new install, an overhaul on a 7 to 10 year unit can restore performance to near-new for a tenth of the cost.
Free gas top-up included
If your refrigerant is low after we put the unit back, we top it up for free. Not a hidden $80 surprise like other companies.
Full removal, not "in place"
Some companies call a chemical wash an "overhaul." We physically take your fan coil off the wall. That's the real definition.
Honest assessment first
If a chemical wash will fix your problem, we'll tell you. We don't push overhaul on units that don't need it.
BizSafe 3 and GST-registered
Fully licensed, insured and compliant. Real company, not a freelancer with a logo.
The Lion City Process
Our chemical overhaul, step by step
The steps unique to overhaul are highlighted. These are what separate it from a chemical wash.
1Cover the area below the aircon
Floor sheets and furniture protection go down first. We treat your home like our own.
2Test the unit before disconnecting
Power on, check airflow, listen for noises and document any pre-existing issues, so we know exactly what we're dealing with.
3Overhaul stepDisconnect the unit
Refrigerant pumped down to the outdoor compressor, electrical isolated. Done correctly so no gas is wasted.
4Dismantle the covers
Front cover, swing flap and filter housing carefully removed.
5Overhaul stepFully remove fan coil from wall
The complete fan coil unit comes off the bracket and out of the room. This is what makes it an overhaul.
6Take out water tray and blowe
The drainage tray and fan roller (blower wheel) are separated from the main unit.
7Overhaul stepMove everything to wash area
All parts taken to a designated wash location, usually a balcony or service yard, where we can work cleanly.
8Overhaul stepSoak components in chemical bath
Coil, blower, water tray and casing all get aircon-grade chemical solution. Years of compacted grime starts breaking down.
9Overhaul stepPressure-jet wash all parts
Every dismantled component goes under high-pressure jet individually. Hidden mould, jelly and bacteria flushed out.
10Rinse thoroughly
Multiple rinse cycles to ensure no chemical residue stays on any component.
11Dry everything completely
No reassembly until everything is fully dry. Wet reassembly causes electrical issues and corrosion.
12Vacuum the drainage pipe
Drainage line vacuumed clear. Often releases years of accumulated sludge that's been causing leaks.
Transparent Pricing
Tiered pricing. Free gas included.
Wall-mounted fan coils only. The free gas top-up alone is worth $80, built into every overhaul.
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Island-Wide Coverage
Chemical overhaul all over Singapore
HDB flats, condos, landed properties and small commercial. We can dismount and reinstall fan coils anywhere on the island.
Our Services
Everything your aircon might need
Six dedicated services. Honest pricing on each. No surprise add-ons at the door.
★★★★★
"Sarwer and team did a good job in servicing and chemical overhaul for our residence. Good explanation in showing us our condensation problem in our trunking." Mervin Ang February 2025
★★★★★
"The only Air Con service provider I've come across that did a proper chemical overhaul unlike others. You trained your men well, did not give excuses and showed me the pipe flaws from my previous contractor." Loh MuiHeng January 2025
★★★★★
"My aircon techs told me chemical cleaning cannot be done due to installation fault. Lion City's technician inspected and said chemical overhaul can be done. Now my aircon is finally cleaned up properly!" Customer (Trustindex) January 2026
★★★★★
"Liton, Kamrul and Asad did chemical overhaul for my 10 year old aircon (also leaking) and now everything works perfectly. Great service." Lion City customer December 2024
★★★★★
"Aircon chemical wash and service done excellently by Lion City. Most recommended technicians Liton and Kamrul. Thanks guys." Chia Richard January 2025
★★★★★
"Hands down one of the best aircon companies I've engaged. Smooth process and very trustworthy. Replaced units and the compressor with Lion City." Charlotte Chan February 2026
Common Questions
Aircon chemical overhaul FAQ
Quick answers to what most Singapore homeowners ask before booking.
How much does an aircon chemical overhaul cost in Singapore?
Type your paAt Lion City Aircon, an aircon chemical overhaul Singapore uses tiered pricing on wall-mounted fan coils: 1 unit $150, 2 units $280, 3 units $390, 4 units $480, and just $100 per unit for 5 or more units. All prices exclude 9% GST. Every overhaul includes a free gas top-up if your refrigerant is low after reassembly. Note: 24,000 BTU single-split units are +$30 per unit due to the larger fan coil size.ragraph here
What's the difference between a chemical wash and a chemical overhaul?
A chemical wash is done with the fan coil still mounted on the wall: chemical is applied to the coil and rinsed. A chemical overhaul takes it further: the entire fan coil is dismantled and removed from the wall, then every individual component (coil, blower wheel, water tray, casing) is chemical-washed and pressure-jet rinsed separately. Overhaul is the deepest clean possible without replacing the unit.
When do I need an overhaul instead of just a wash?
You need an overhaul when a chemical wash won't fix the problem. Common signs: persistent water leaks even after a chemical wash, severe blockage in the drainage system, coils visibly clogged with hardened jelly, units 5+ years old that have never been deep cleaned, or aircons that no longer cool properly despite gas being topped up. If a chemical wash didn't solve it, an overhaul almost certainly will.
Is the free gas top-up really free?
Yes. If your aircon needs a gas top-up after reinstallation, we include it at no extra cost. This is part of the overhaul package because removing and reinstalling the fan coil sometimes results in slight refrigerant loss. We won't surprise you with a separate gas charge at the end.
Is the free gas top-up really free?
A chemical overhaul takes around 45 to 60 minutes per fan coil unit. The time is mostly the disassembly, washing, drying and reinstallation. For a 3-unit HDB, plan for roughly half a day.
Will removing the fan coil damage my wall?
No. Our technicians dismount the fan coil carefully without damaging the mounting bracket or wall. We also re-secure everything properly when reinstalling. If your unit was poorly installed originally, we may even fix bracket alignment as part of the work, at no extra cost.
How often should I do a chemical overhaul?
Most homes don't need one regularly. We recommend a chemical overhaul once every 3 to 5 years for heavily used units, or whenever a chemical wash doesn't solve a persistent issue like leaks, smell or weak cooling. With proper quarterly servicing, many units never need an overhaul at all.
Can I do an overhaul instead of replacing my old aircon?
Often yes. A chemical overhaul on a 7 to 10 year old unit can restore performance to near-new and extend its life by several years, for a fraction of the cost of a new install. We'll inspect first and tell you honestly whether overhaul makes sense or replacement is the better long-term call.
Will you push me to do an overhaul if I don't need it?
No. Multiple Google reviews specifically call this out: we recommend the simpler service first whenever it'll fix the problem. Overhaul is only suggested when chemical wash isn't enough. We make our money from long-term customers, not from upselling unnecessary work.
Which areas in Singapore do you cover?
All of Singapore: HDB, condo, landed and small commercial. Tampines, Bedok, Pasir Ris, Punggol, Sengkang, Hougang, AMK, Bishan, Toa Payoh, Yishun, Woodlands, Sembawang, Jurong, Bukit Batok, Choa Chu Kang, Clementi, Queenstown, Bukit Merah, Marine Parade, Kallang, Geylang, and everywhere in between.
Aircon gas top-up Singapore. Diagnosis first, no surprises.
Honest aircon gas top-up Singapore service for R22, R32 and R410A systems. We don't quote a flat price online because every job is different. We troubleshoot first ($80, waived if topping up), then quote you the actual amount based on gas type and how much your system needs. Multi-split typical: $80 to $200.
Need Something Else?
Other Lion City aircon services
Chemical Wash
Deep clean for stubborn grime, $80 per unit
Chemical Overhaul
Full disassembly and reset, $100 to $150 per unit
Gas Top-Up
Restore cooling, $80 to $200 typical
Aircon Repair
PCB, leaks, motor issues, $80 diagnosis
Installation
System 1 to 5, VRV, Chiller, from $1,050