What a proper AC service includes — and what to refuse

The test: what leaves the property

A genuine AC service produces dirt. Coils that have been cleaned yield visible residue; a blower wheel that has been cleaned leaves a blackened cloth; a flushed drain line produces water carrying what was blocking it. If a technician arrives, spends twenty minutes and leaves with nothing visibly removed, the system has been inspected at best.

This is not a subtle test and it does not require technical knowledge. Ask to see the filters before and after, and ask what came out of the drain line. The answers are immediate and revealing.

What should be on the list

Indoor and outdoor coils degreased and washed, not brushed. Blower wheel cleaned — this is laborious and frequently skipped, and it is where airflow is lost. Filters washed or replaced with their condition shown to you. Condensate drain flushed and tested with water. Refrigerant pressure measured against the manufacturer's specification and the reading reported. Electrical connections, contactor and capacitor inspected for heat damage. Thermostat calibration verified against a real thermometer. Airflow checked at each outlet.

That is roughly ninety minutes to two hours of work for a typical villa system, and it is what the phrase 'full service' should mean.

What to refuse

Refuse refrigerant added without a pressure reading and an explanation of where it went. Refrigerant is not consumed; a system needing gas annually has a leak, and topping it up without tracing that leak is a subscription rather than a repair.

Refuse component replacement without being shown the fault. A capacitor, contactor or fan motor being changed is fine; being unable to see the failed part or hear why it failed is not. Refuse sanitising sprays applied to ducts that have not been mechanically cleaned first, which is perfume over a problem. And refuse any price that changes once the technician is inside the property — the quote should be fixed before work begins.

Frequency, honestly

For most Dubai properties, twice a year is right: a thorough service before summer and a lighter check in autumn. Systems under heavier load — large villas, high occupancy, ducted systems serving many rooms — benefit from three. Once a year is workable for lightly used apartments but leaves less margin.

Beware anyone recommending quarterly servicing for a standard home. It is not wrong exactly, but it is selling frequency in place of thoroughness, and two proper visits will outperform four superficial ones every time.