By The Big Buy desk · Last verified 7 October 2026
A general aircon service in Singapore commonly costs about S$50 to S$70 for a single unit booked on its own, falling to roughly S$20 to S$30 per unit when three or more are done together. Deeper cleans cost more: a chemical wash is typically S$80 to S$150 per unit and a chemical overhaul S$130 to S$250, according to 2026 price guides. NEA advises checking the filter once a month, servicing regularly and getting units inspected at least once a year; most homes that run the aircon nightly service every three to four months. When replacing, a System 3 for a four-room HDB flat often costs S$3,500 to S$6,400 installed, and an efficient 5-tick unit lowers the electricity bill for years.
A well-kept aircon cools faster, costs less to run and lasts longer. A little routine goes a long way.
Quick facts
- Filter: NEA says check it monthly and clean or replace it when needed.
- Servicing: regular servicing, with an inspection at least yearly; every 3 to 4 months suits nightly use.
- Temperature: NEA recommends 25°C; each degree higher saves about 3% on running costs.
- General servicing: roughly S$20 to S$70 per unit, cheaper per unit in bulk.
- Refrigerant rule: split aircons sold since 1 October 2022 must use refrigerant with a global warming potential of 750 or lower.
- GST: GST-registered firms add 9%; check whether a quote includes it.
What each service costs
There is no official price list; these are typical ranges for wall-mounted indoor units from published 2026 guides and a booking platform’s “from” prices. Ceiling cassette units cost more.
| Service | What it involves | Typical price per unit |
|---|---|---|
| General servicing | Clean filters, coil surface, drainage flush, check operation | S$50–70 single; S$20–30 for 3+ units |
| Chemical wash | Coil and fins cleaned with chemicals, unit partly dismantled | S$80–150 |
| Chemical overhaul | Unit fully dismantled and every part soaked and cleaned | S$130–250 |
| Gas top-up | Refrigerant topped up after a leak check | About S$80–200, by refrigerant type |
| Condenser cleaning | Outdoor unit cleaned | About S$50–150 |
Annual contracts commonly price each visit lower than one-off bookings. Get two or three quotes, and ask what is included before agreeing to any add-on on the day.
How often should I service?
| How you use it | General service | Deeper clean |
|---|---|---|
| Every night, or day and night | Every 2 to 4 months | Chemical wash about once a year, or when it smells or drips |
| A few nights a week | Every 4 to 6 months | When cooling weakens or water leaks |
| Rarely | Every 6 months, plus a yearly inspection | Only if a technician finds a problem |
Signs it is due: weaker airflow, a musty smell, water dripping from the indoor unit, or a jump in your electricity bill.
When to replace, and what it costs
Replacement makes sense when repairs keep coming back, the compressor fails, or an old, low-tick system is costing you heavily in electricity. Typical 2026 supply-and-install estimates from a published guide:
| System | Common home | Estimated installed price |
|---|---|---|
| System 1 | One room | S$1,270–2,200 |
| System 3 | Four-room HDB | S$3,500–6,400+ |
| System 4 | Larger flat or condo, premium brands | S$7,700–12,300+ |
Extras that often appear on the bill: piping beyond the standard length, removal of old units, and electrical or trunking work. Condo installations can cost more. Ask that old units be handed to a proper recycler so the refrigerant is recovered rather than released.
Choosing the new unit
- Ticks matter: more ticks on the energy label means lower running costs over the unit’s life.
- Right size: an undersized unit runs flat out; an oversized one wastes money.
- Trained installer: NEA points to ITE’s Certificate of Competency for technicians handling household refrigerant.
- Vouchers: eligible HDB households can use Climate Vouchers on energy-efficient appliances, including 5-tick aircons.
The WahLiao Verdict
Clean the filters yourself each month, book a general service for all your units together every three to four months, and keep chemical washes for when the unit truly needs one. Set it at 25°C with a fan running. When it is time to replace, buy the most ticks you can afford and get at least three itemised quotes; the cheaper unit can be the dearer one after five years of bills.
Questions people ask
Is a chemical wash needed every time?
No. Regular general servicing keeps most units healthy. A chemical wash is for built-up dirt, smells or leaks that a general service does not fix.
Why is my aircon leaking water?
Usually a clogged drainage pipe or dirty coil. A general service with a drain flush often solves it; persistent leaks need a technician’s check.
Do I need a gas top-up regularly?
No. Refrigerant runs in a sealed loop. If it is low, there is a leak, which should be found and fixed rather than topped up repeatedly.
What temperature saves the most?
NEA recommends 25°C. Every degree higher saves about 3% on running costs.
Sources: National Environment Agency, energy-saving tips for air-conditioners; National Environment Agency, refrigerant rules for household aircons; Helpling, published aircon service prices; The MoneyBees, 2026 servicing cost guide; SmartCalculator.sg, 2026 installation cost guide. The Big Buy explains; it does not advise.
Read next: Energy Labels and Climate Vouchers: What the Ticks Mean · Your Electricity Bill: SP’s Tariff and the Open Electricity Market · Back to The Big Buy
For what’s worth it this week, with the bill shown, read The WahLiao Week.
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