"Chemical wash" is the most searched aircon job in Singapore after installation, and the price question comes up every time. Rather than quote a vague industry range, we went to the websites of the companies in our directory and wrote down what they actually publish.
The short answer
Across 12 companies that publish a price on their own website (checked 2026-10-22), the lowest advertised one-unit figure ranged from $80 to $140, with a median of $87.50. Most companies charge less per unit when you book several units in one visit, so a home with three or four units will usually pay less per unit than the single-unit figure.
Chemical wash (one unit): published prices
12 companies, from each company's own website, checked . Prices are as published and may have changed. Check whether GST, the outdoor unit and transport are included.
| Company | Published price | Basis |
|---|---|---|
| Aircon Servicing & Repair Singapore | $80 | per unit; prices exclude 9% GST · source |
| EZ Aircon | $80 | from, per unit · source |
| Airconman Sg Pte Ltd | $85 | 1 fan coil unit · source |
| Airmaxx Aircon Servicing | $85 | 1 unit · source |
| City Cooling Pte Ltd | $85 | from, per unit; fan coil, no dismantling · source |
| HANDDI.IO PTE LTD | $85 | 1 unit · source |
| Airemax Aircon Pte. Ltd. | $90 | per wall-mounted unit · source |
| VFix Aircon Pte Ltd | $100 | 1 unit · source |
| Cool Aircon | $110 | from · source |
| 338 Aircon | $120 | 1 unit, 9K BTU · source |
| All Best Air-Conditioning & Electric Pte Ltd | $120 | per fan coil up to 16K BTU, ad hoc · source |
| aircond service centre pte ltd | $140 | from; described as dismantled deep cleaning · source |
Why the prices differ
The gap between the lowest and highest figure isn't only about one company being cheaper. The jobs are often not the same:
- What is being washed. Some companies wash the coil and blower with the unit on the wall. Others take parts out first. One company in the table describes its chemical wash as a dismantled deep clean, which is closer to what others call an overhaul.
- Unit size. Several price lists are for 9,000 to 12,000 BTU wall units. Larger units, ceiling cassettes and ducted units usually cost more.
- Outdoor unit. Washing the condenser is often a separate line item.
- GST. At least one company states its prices exclude GST. Many don't say either way.
- Number of units. Package pricing lowers the per-unit cost.
What a chemical wash involves
The technician opens the indoor unit, fits a bag or tray to catch runoff, sprays a coil cleaner onto the fins and often the blower wheel, and rinses it through. The unit stays on the wall in most cases. It reaches dirt that a general service can't, which is why it is usually booked when the air smells musty or airflow feels weak even with clean filters.
If the unit has gone years without a deep clean, or there is mould in the drain tray, a company may suggest a chemical overhaul instead. Our guide on chemical wash vs overhaul explains the difference.
How to compare quotes
- Ask for the price per unit and for your total number of units.
- Ask whether the unit is taken apart, and which parts are washed.
- Ask whether the outdoor unit is included.
- Ask whether GST is included.
- Ask about warranty on the work.
Getting two or three written quotes for the same units is the most reliable way to see where a price sits. See all companies that list a chemical wash on their own websites.