AC maintenance on the Costa del Sol: when to do it and what it includes

Why the Costa del Sol climate is harder on your AC

Around Marbella, air conditioning units run for months at a stretch — through the spring-summer heat and, increasingly, through winter as heat pumps see more use. Add the coastal air to that: salt in the atmosphere speeds up corrosion on the outdoor unit's aluminium fins, and construction dust, common all along this coast, clogs filters faster than in a typical inland climate. A unit that would go two years without a service elsewhere starts losing performance sooner here.

When to service your air conditioning

As a general rule, one full service a year is enough for normal home use, ideally done before the heaviest-use season starts — in late spring, ahead of the real heat. If the same unit also works as a heat pump in winter, or if it runs many hours a day for a larger household, it's worth adding a second, lighter check before winter.

What a full maintenance visit includes

A full service is more than "cleaning the filter." It's a structured process that works through the unit from the inside out:

• Cleaning the filters and, when needed, the indoor unit's coils.
• Checking and clearing the drain, to prevent leaks and damp.
• Inspecting the outdoor unit: condition of the fins, cleaning if required, and checking the fan.
• Measuring the unit's operating parameters (temperatures, and circuit pressure if needed).
• Before-and-after photos of the equipment, with a digital work report.

On ducted systems this also covers the grilles and dampers, and if the system is zoned — for example with Airzone — the sensors and control unit are checked too.

Full service or quick check: not the same thing

Not every maintenance visit needs to be equally thorough. A full service gets into deep cleaning; a check-up is a faster confirmation that everything's still in order — outlet temperature, any stored error codes, the drain — meant to sit between two full services. We're currently preparing Brizemar Care, a plan that combines both types of visit across the year.

Getting your AC ready for summer

If you only do one thing before summer, make it this short list:

1. Clean or replace the filters — many models let you pull them out and rinse them with water.
2. Clear leaves, dust or plants away from the outdoor unit.
3. Run the unit for a few minutes before the real heat arrives and confirm it's cooling normally.
4. If you notice odd noises, smells, or it's taking longer to cool, get it checked before the season starts, not mid-heatwave.

Common mistakes to avoid

A few habits shorten an air conditioner's life and lead to bigger repairs down the line. The first is putting off maintenance until the unit is obviously struggling — by then, dirt and wear have usually built up far more than they would with regular servicing. The second is trying to top up refrigerant without finding the leak first, which just empties out again before long. The third is ignoring odd noises or smells because they don't seem urgent, when they're often the first sign of a problem that's cheaper to fix early. And the last is running the unit with a visibly blocked drain, which sooner or later causes leaks and damage to the ceiling or walls around it.

Signs your AC needs attention now

You don't need to wait for the annual service if you notice any of these: the unit cools less than before, takes longer to bring the room down to temperature, makes new noises, smells odd when it starts up, or your electricity bill has gone up without a change in how you use it. If the air isn't cooling at all any more, that's a repair, not preventive maintenance.