When's actually the best time of year to service — or replace — an AC in Dubai?

Think of it as two service windows and one planning window, not a random call-out. The single worst time to touch your AC in Dubai is the peak of summer, July and August, because that's when every technician is slammed, waits are longest and you have the least room to shop around or negotiate. So plan around it. First, a service in spring before the heat, so the unit goes into its hardest months with clean coils, a clear drain and correct gas. Second, a check at the end of summer once the peak eases, to catch what the heat quietly stressed, that's the one people skip, and it's covered in the thread on what a proper end-of-summer health check should actually include. For the unit you already suspect is dying: don't wait for it to fail in August. Use that post-summer check as your decision point, and if the numbers say replace, do it in the cooler months when you can weigh repair against replacement calmly and book a planned install rather than an emergency one at a premium. Booking either job in the shoulder season also just gets you a faster, less rushed visit. If you'd rather not track any of this yourself, a planned AC maintenance on a fixed schedule puts the timing on someone else.