Why summer is hard on an AC
In peak summer an AC may run for most of the day, against outdoor temperatures that push the outdoor unit to its limits and humidity that adds a heavy moisture load indoors. Dust and sand add to the strain by clogging filters and coils. Maintenance is about keeping air moving freely and heat leaving the system.
Clean or replace the filter regularly
The filter is the single most useful thing an owner can maintain. In heavy summer use, check it every few weeks. If it is grey with dust, wash it as the manual suggests, let it dry fully, and refit it. A clean filter improves airflow, cooling and efficiency, and reduces the dust circulating in the room.
Look after the outdoor unit
- Keep the area around it clear of boxes, plants and rubbish so air can flow freely.
- Where possible, avoid blocking its ventilation with enclosures or screens that trap hot air.
- Gently remove loose dust and debris from the outer grille. Leave the coil fins to a technician, as they bend easily.
- Check that the unit is stable and that the mounting has not rusted or loosened.
Check the drain line
Humidity means a lot of condensate. If the drain pipe is partly blocked, water backs up and drips into the room. Look for water stains below indoor units, and mention any damp patches or dripping to your technician. Some units have a drain tray that needs cleaning during a service.
Use sensible settings
Setting the thermostat extremely low does not cool a room faster. It simply makes the unit run longer. A moderate setting, doors and windows kept closed, and curtains or blinds drawn against afternoon sun let the system keep up more easily. Using a fan to move cooled air around can make a room feel cooler at a slightly higher setting.
Book a service before the season, not during it
A pre-summer service lets a technician clean coils, check the drain, test the electrical components, and look for early signs of wear or a refrigerant leak. Booking before the hottest months is generally easier than in the middle of a heatwave, when many households call at the same time.
If your building uses district cooling
Some Dubai buildings use central chilled water rather than individual outdoor units. In that case the central plant is managed by the building or provider, but the indoor fan coil unit, its filter and its drain are often still your responsibility. It is worth asking your landlord or building management what is covered.
Signs it is time for a technician
- Cooling noticeably weaker than last year
- Water leaking from an indoor unit
- Ice on the unit or pipes
- A burning or persistent musty smell
- The unit tripping the breaker or switching on and off repeatedly
For more on diagnosing these, see common AC problems and how to fix them. If you would like your system checked, our AC repair and servicing team can help.
