Check filters, vents, and visible airflow paths
Start with the air filters in each indoor unit. In Abu Dhabi, dust accumulation is the most common reason AC performance declines between services. Most split-unit filters can be removed and washed with water - if they are heavily blocked, deformed, or damaged, they should be replaced. This alone can restore noticeably better airflow.
Also inspect return air vents and supply grilles for dust build-up and any obstructions. Check that furniture, curtains, or stored items have not been positioned directly in front of vents. Restricted airflow forces the system to work harder and extends the time it takes to reach the set temperature.
Test cooling performance and temperature consistency room by room
Run each AC unit and check whether it reaches the set temperature at a reasonable speed. A unit that runs for extended periods without cooling the room properly is usually dealing with a refrigerant issue, a dirty evaporator coil, or a failing component - not just dust.
Compare cooling between rooms. In villas and multi-room apartments with separate units, significant differences in how rooms cool down often point to one unit that needs attention before the summer load increases. Note which rooms feel slower and report these when booking a service visit.
Clear drainage lines and schedule professional servicing before May
Check that condensate drain lines are clear. Blocked drainage causes water to back up inside the indoor unit and drip from the casing - a common complaint in Abu Dhabi homes during humid months. Pouring a small amount of water into the drain tray and watching whether it clears quickly is a useful check.
If the system has not been professionally serviced within the past twelve months, arrange a full service before May. A proper AC service includes coil cleaning, refrigerant level check, electrical connection inspection, and drainage clearance. Booking during March or April gives more scheduling flexibility before demand increases.