Checklist · Maintenance
Aircon Maintenance Checklist — Homeowner & Light Commercial
Aircon that is maintained on a schedule cools better, lasts longer, and costs less to run. This checklist sets out exactly what to clean and check — monthly, quarterly, and yearly — for homes and small offices in KL & Selangor, with a clear line between what you can do yourself and what needs a technician. Print it or save it and tick items off as you go.
Why Maintenance Matters
In Malaysia's climate, aircon runs hard all year. A neglected unit clogs with dust and biofilm, which restricts airflow and forces the compressor to run longer to reach the set temperature — raising your electricity bill, shortening the unit's life, and worsening indoor air quality. Regular maintenance reverses all of that for a fraction of the cost of a repair or replacement.
Homeowner Checklist
Every 2–4 weeks — do it yourself
- ☐ Remove and rinse the indoor unit filter under running water; dry fully before refitting
- ☐ Wipe the indoor unit casing and air-outlet louvres with a damp cloth
- ☐ Check the air feels cold and the airflow is strong
- ☐ Clear leaves, debris, and clutter from around the outdoor unit (keep ~30cm clearance)
- ☐ During the haze season or in dusty areas, clean the filter weekly
Every 3 months — book a service
- ☐ Book a general aircon service (coil face clean, drain flush, refrigerant pressure check, cooling test)
- ☐ Check for any water marks, drips, or staining below the indoor unit
- ☐ Listen for new rattles, hissing, or vibration
- ☐ Note if cooling takes longer than usual to kick in
Every 6–12 months — chemical wash
- ☐ Book a chemical wash for each wall-mounted unit (deep clean of coil, blower wheel, drain tray)
- ☐ Service every 6 months for high-use rooms, or homes with pets, small children, or smokers
- ☐ Have the outdoor condenser coil cleaned at the same visit
Once a year — technician check
- ☐ Full refrigerant pressure and leak check (a top-up is only needed if there is a leak)
- ☐ Electrical check: capacitor, contactor, and connections
- ☐ Inspect insulation on the copper piping and the drain gradient
- ☐ Confirm the outdoor unit mounting and brackets are secure
Light Commercial Checklist (offices, shops, F&B, clinics)
- ☐ Weekly: filter clean on high-use cassette and wall units; clear condensate drain trays
- ☐ Monthly: visual check of all units; log any unit that cools poorly or drips
- ☐ Quarterly: professional service of every unit; chemical wash for kitchen and high-traffic areas
- ☐ Every 6 months: cassette unit chemical wash; drain pump test
- ☐ Annually: full electrical and refrigerant inspection across the site; replace worn parts proactively
- ☐ Keep a maintenance log per unit (date, service type, technician) for warranty and audit purposes
- ☐ Cooling towers: monthly maintenance and chemical dosing; keep DOSH water-treatment records where required
Maintenance Frequency at a Glance
| Task | Home | Light commercial |
|---|---|---|
| Filter clean | Every 2–4 weeks | Weekly |
| General service | Every 3 months | Quarterly (all units) |
| Chemical wash | Every 6–12 months | Every 6 months |
| Refrigerant & electrical check | Yearly | Yearly |
| Cooling tower dosing | n/a | Monthly |
Seasonal Notes for Malaysia
- Haze season: fine particulate loads the filter fast — clean it weekly and bring forward a chemical wash if cooling drops.
- Monsoon / heavy rain: check the outdoor unit drainage and that the condensate line is clear so water does not back up into the room.
- Before a long trip: clean the filter and run the unit on fan mode for an hour to dry the coil, which prevents musty smells building up while you are away.
- After renovation: book a chemical wash — plaster and construction dust clogs the coil quickly and a normal service will not shift it.
Do It Yourself vs Call a Technician
Safe to DIY: filter cleaning, wiping the casing, keeping the outdoor unit clear, and checking the drain outlet. Leave to a technician: opening the coil cover, cleaning the blower wheel, anything involving refrigerant or gas, and any electrical part. These need the right tools and training, and DIY attempts often bend the coil fins or break the drain tray.
Frequently Asked Questions
How often should I service my aircon in Malaysia?
For a typical Malaysian home running the aircon several hours a day, do a light service every 3 months and a full chemical wash every 6 to 12 months. Offices, restaurants, and homes with small children or pets benefit from a chemical wash every 6 months. Cooling towers need monthly maintenance.
What aircon maintenance can I do myself?
You can safely clean the filter every 2 to 4 weeks, wipe the indoor unit casing, keep the area around the outdoor unit clear, and check that the drain outlet is not blocked. Anything that involves opening the coil cover, handling refrigerant, or electrical parts should be left to a technician.
How often should I clean my aircon filter?
Clean the filter every 2 to 4 weeks in normal use, and weekly during the haze season or in dusty environments. Remove the filter, rinse it under running water, let it dry fully, and refit it. A clean filter restores airflow and cuts power use.
Does regular aircon maintenance lower my electricity bill?
Yes. A clogged filter and dirty coil force the unit to run longer and harder to reach the set temperature, which raises power consumption. Keeping the filter clean and the coil serviced restores airflow and cooling efficiency, so the compressor cycles less.
When does my aircon need a chemical wash instead of a normal service?
Choose a chemical wash when the unit cools weakly despite a clean filter, gives off a musty smell, drips water, or has not had a deep clean in 12 months. A normal service is enough for routine quarterly upkeep when there are no symptoms.