Pre-summer cooling checklist for a Dubai villa, getting AC and the chiller or FCU side ready before peak heat?

Smart to do it in spring, that timing is the whole point. For any villa: clean or replace all AC filters, have the indoor and outdoor coils cleaned (dust-caked coils are the top efficiency killer here), clear and flush the condensate drains before they block and overflow in humidity, and check airflow and that each unit actually pulls its room down, weak cooling now is a leak or a dirty coil, not a surprise in July. On chiller or FCU homes there's an extra layer: service the fan-coil units (filters, coils, drain trays), check the chilled-water valves and pipework for leaks, and make sure the FCUs are balanced. The reason to do all this in mild weather is simple, you find the weak unit when a technician is free and parts are easy, not during the peak-heat rush when everyone's failing at once. Booking a water chiller service in Dubai for the FCU and chilled-water side in spring is exactly the right call. Find the weak link before the heat does.