How Long Aircon Servicing Takes and How to Prepare Your Home

How Long Does Aircon Servicing Take?

A general service takes around 30 to 45 minutes for a single wall-mounted unit in decent condition. The honest answer depends on how many units you have and how dirty they are. A typical 3-room HDB flat with 3 or 4 units is usually done in a morning, an afternoon or an evening. When you book a servicing slot, we give you the time estimate for your units with the quote.

Each unit goes through the same 8 points: filter, coil, drain line, drain pan, refrigerant pressure, thermostat, electrical check and a final airflow and temperature test. You can read what each step involves in the 8-point checklist.

Number of units	Rough time on site	Price
1 unit	About 30 to 45 minutes	S$50
2 units	About 1 to 1.5 hours	S$55
3 units	About 1.5 to 2 hours	S$70
4 units	About 2 to 2.5 hours	S$85

If you have three units, plan for roughly 1.5 to 2 hours on site. These are rough figures. Units that have gone many months without servicing, or that are hard to reach, take longer. Multi-split systems with one outdoor unit can be a little quicker per unit because the outdoor checks are done once.

You may see shorter claims elsewhere. A 2026 guide from Singapore provider Coogle puts a general service at 20 to 40 minutes per unit. Our range is a bit longer because it covers all 8 checks, the protective sheets and the clean-up on every unit. If a quote promises much less time, ask which steps are skipped.

Planning tip

If you need the units ready for guests or a handover, book a slot with time to spare. If the technician finds a fault that needs a repair or a chemical wash, you will want room in the day to decide.

What Makes a Visit Take Longer

Five things add time to a visit, and it helps to know them before you plan your day.

• Months without servicing. A unit that has gone a year or more without a service has thick dust on the filter and coil and slime in the drain line. Each step takes longer, and the technician may find it needs a chemical wash instead.
• Hard-to-reach units. Units mounted very high, above a wardrobe or behind a built-in shelf need more set-up time for the ladder and protective sheets.
• Outdoor units in awkward spots. Most HDB aircon ledges are easy to reach from a window. Some condo and landed home condensers sit on roofs, side walls or in tight corners, which slows the pressure check.
• Ceiling cassette and ducted units. Landed homes in Yio Chu Kang and Sembawang Hills often have these. Their panels and filters are larger and sit in the ceiling, so each one takes longer than a wall-mounted unit.
• Faults found on the day. If the technician spots a leak, low pressure or a failing part, they stop, explain it and quote it. If you approve a repair on the spot, the visit runs longer.

A chemical wash is the biggest jump in time. Published ranges from Singapore providers show how far it can stretch the visit:

Type of service	Typical time per unit
General servicing	20 to 40 minutes (Coogle, 2026)
Chemical wash	45 to 90 minutes (Above All Aircon)
Chemical overhaul	2 to 4 hours (Coogle, 2026)

Regular servicing is the easiest way to stay at the short end. Coogle’s 2026 guide treats servicing every 3 months as the baseline for HDB homes running 2 to 3 units daily, with a chemical wash once a year. As for leaks, the same company says a blocked drainage pipe is the most common cause in HDB flats, so a drip found on the day often means a longer visit.

How to Prepare Your Home

Clear the floor under each unit and make sure the technician can reach your aircon ledge. A little preparation makes the visit faster and keeps your room tidy.

• Clear the space under each unit. Move small furniture, electronics and anything on the floor below the indoor unit. The technician needs to stand on a step ladder and lay a sheet underneath.
• Clear a path to the aircon ledge. The outdoor condenser unit sits on the aircon ledge outside a window. Make sure the window can be opened and any plants or items near it are moved.
• Have the remote controls ready. Each unit is tested at the end, so keep the remotes where they can be found.
• Tell us about any problems. If a unit has been dripping, smelling or making noise, mention it when you book. The technician can check it on the same visit.
• Secure pets. Keep pets in another room during the visit, both for their safety and to keep hair away from open units.

Take the ledge point seriously. HDB’s killer litter guidelines say nothing should be placed inside or outside your flat in a way that threatens safety, and penalties apply if they aren’t met. Pot plants and loose items near the window are the first things to move.

On the Day: Mess, Protection and Clean-Up

When the technician arrives, each unit is checked first and the work and price are confirmed before anything starts. Here is what happens next:

1. Plastic sheets go over beds and floors under each indoor unit.
2. Filters are washed and the coil is cleaned.
3. The drain line is flushed into a container.
4. Each unit is switched on and tested for airflow and temperature.

The drain flush matters for more than leaks. Stagnant water in a blocked drain or pan can become a breeding spot for Aedes mosquitoes, which is why NEA keeps a close eye on standing water in homes.

When all units are done, the sheets come off and the area is cleaned up. You pay after the job. The 90-day workmanship warranty starts from that day.

If you are not sure your units are due, see the signs your aircon needs servicing. Landlords and tenants preparing a flat should also read about aircon servicing before a tenancy handover.

So, how long does aircon servicing take? For most Ang Mo Kio flats, it’s under two hours for three units, as long as the space is clear and the units aren’t badly overdue. Slots run to 9 PM on weekdays and Saturdays and to 8 PM on Sundays, and the price is fixed before work starts with no callout fee. Pick a slot that suits your day, and we’ll confirm the time with your quote.