The short answer: put a professional check-up on a three-to-six-month calendar, and between visits keep the filter clean and take a look at the condensate drain outlet. Everything else — refrigerant, pipework, the motor and anything electrical — belongs to a technician. The three-to-six-month figure is the interval The Straits Times reported in September 2026 as usually adequate for most Singapore households, not an SP Group or Energy Market Authority standard. [1]
The scale of the reward is easy to underestimate. A white paper on cooling published by SP Group and Temasek puts air-conditioning at up to 24 per cent of the average household electricity bill in Singapore, with about 80 per cent of households owning air-conditioners. A filter that chokes airflow is therefore not only a comfort complaint; it is a line on a bill that most of us pay every month. [2]
The baseline: three to six months, shortened when dust rises
The same September 2026 report found that more frequent servicing may be worthwhile during a haze period, and in homes with pets, heavier air-con usage or other conditions that produce higher levels of dust and airborne particles. Air-con servicing professionals there generally recommend adjusting servicing frequency to usage patterns, home conditions and the surrounding environment. In other words, the interval is not a date on the calendar so much as a response to how hard your home is working. [1]
Consider a hypothetical case: a two-bedroom flat with a cat, a living-room unit running most evenings and windows shut against the haze. That home sits squarely in the pets-and-heavy-use group, so a three-month gap is the sensible booking rather than six. The reason the interval matters is mechanical. SP Group principal technical officer Amir Talib told the same report that a clogged filter restricts airflow and makes the home cooling system work harder, leading to poor cooling, higher utilities bills and potential equipment damage. [1]
Two faults, two owners: the filter and the drain
Start with the part that is formally your job. SP Group's consumer energy-saving tips tell households to clean the filters regularly, because dirty filters impede airflow and cause energy wastage, and separately to service air-conditioners regularly. The same leaflet pairs that with setting the temperature to 25°C or higher, since a lower setting uses more electricity, and shutting doors and windows while the unit runs. Note what it does not say: how often. No interval for air-con filter cleaning appears in that guidance, so any rhythm you adopt is your own. [3]
The condensate drain check is a different fault, and conflating the two is a common mistake. A clogged filter is a performance problem: the unit strains. A clogged drainpipe is a water problem: dirt and dust build up in the pipe, condensation water flows back, and the indoor unit leaks. The September 2026 report recounted a resident whose living-room unit was dripping slightly, with the attending team finding a clogged drainpipe, and noted that clogged drainpipes are a common issue for all air-con users, whether on a centralised cooling system or a conventional one, resolvable through regular servicing. [1]
Where your two jobs stop and the technician begins
SP Group's own leaflet points past the filter: besides the filters, the condition of other components such as the refrigerant, pipe and motor also affects energy efficiency. That is the practical reason a clean filter cannot stand in for a service visit. The filter is one item on the technician's list, not the list itself, and refrigerant, pipework and motor are not household jobs. [3]
Electricity is the hard boundary, and it comes from the regulator. In its handbook for the electrical installation licensing regime, published in January 2010 and stating that its procedures and requirements are accurate as at the time of issue, the Energy Market Authority sets out that only licensed electrical workers are allowed, under their licence, to design, install, repair, maintain, operate, inspect and test electrical and supply installations. The handbook exempts installations used exclusively for domestic purposes from the licensing requirement, and still closes by advising readers, for their own safety, always to engage a licensed electrical worker to carry out electrical work. Read together, the exemption settles who must hold a licence; the closing advice is what routes a wiring job away from your kitchen table. [4]
If your flat runs on chilled water
Not every home has a conventional unit inside it. In Tengah, SP Group's Centralised Cooling System taps centralised rooftop chillers to pipe chilled water to homes instead of using individual condensers, which The Straits Times described as making it more energy-efficient compared with conventional air-conditioners. The equipment you live with is the fan coil unit, so the filter and drain jobs apply to that unit — and much of what a technician checks sits upstream of your flat. [1]
As reported on 28 September 2026, residents using that estate's system are eligible for three years of complimentary regular servicing of their fan coil units under the free MyTengah Care+ programme, which includes twice-yearly servicing sessions, with each additional session then costing $15 per fan coil unit, along with regular system health checks and warranties on the piping, trunking and insulation. Those terms were reported for that estate only, as at 28 September 2026, so check the current ones with SP Group rather than planning around them. [1]
Your next three moves
Book the professional check-up, then set the next reminder three to six months out and pull it forward while haze, pets or heavy use are loading the filters faster. Keep the filter clean between visits, as the utility's consumer advice says. If a rhythm helps, we suggest a monthly glance at the filter and the condensate drain outlet as your own habit — no published guidance sets that interval. [3] [1]
And call a technician at three signals: cooling that has gone noticeably weak, a bill that has crept up, or water dripping from an indoor unit. The first two are the poor cooling and higher utilities bills Talib linked to a clogged filter making the system work harder; the third matches the drainpipe build-up and leaking condensation the report described. Refrigerant, pipe, motor and any wiring are where your involvement ends. [1] [4]
Read next
Sources
- how often should you service your air-con system | The Straits Times
- Taking The Heat Off Cooling: A Greener Way to Cool
- Energy Saving Tips
- Application of Electrical Installation Licence
BUTLER Magazine Editorial · AI-assisted research and writing, reviewed by our automated editorial team. Sources checked 2026-10-09. Featured image: AI-generated editorial illustration.