Why Your Air Conditioner Will Fail in December (And What to Do About It in September)
Every December, we get the same call.
It's pushing 35 degrees in the hinterland, the family's arriving on Friday, and the split system in the living room is blowing air that's somehow warmer than the room. The customer wants to know if we can come out today.
We usually can't. By the second week of December we're booked through to the New Year, and so is every other licensed electrician between Cooroy and Caloundra. It's the worst possible week to need us, which is exactly why it's the week everyone does.
Here's the part that makes it frustrating: most of those calls aren't breakdowns. They're neglect finally catching up.
What actually goes wrong
A split system doesn't usually die suddenly. It degrades, quietly, over a couple of seasons, and then it fails on the first genuinely hot day when you finally ask it to work hard.
Three things cause most of it.
Dust on the coils. Your indoor unit pulls household air across a set of fins to strip the heat out of it. Over a year those fins collect a felt-like layer of dust, pet hair and lint. The system can still run, but it can't transfer heat efficiently, so it runs longer and harder to reach the same temperature. You feel it as "it's just not cooling like it used to."
A blocked drain. Air conditioners pull litres of water out of the air. That water leaves through a condensate drain, and in our climate that drain grows a biofilm of algae and mould. When it blocks, the water backs up. Sometimes the unit shuts itself down. Sometimes it just quietly drips down your wall behind the plaster for a few weeks before you notice.
A gas charge that's drifted low. Refrigerant systems are sealed, but joints weep slowly over years. A system that's low on gas will still blow air, still light up, still sound normal. It just won't get cold. This one needs gauges to detect, which is why it's usually diagnosed in December by someone standing in a hot room.
What our climate does to a system
Air conditioners on the Sunshine Coast live a harder life than the manufacturer's design brief assumed.
The humidity is the big one. Subtropical Queensland means your indoor unit is a permanently damp, dark, dust-fed box, which is close to ideal conditions for mould. That musty smell when the system first kicks on isn't the air conditioner. It's what's growing inside it, being blown into your living room.
Closer to the coast, salt in the air accelerates corrosion on outdoor condenser fins. Out in the hinterland, it's dust, pollen and ash from burn-offs. And everywhere around here, outdoor units are a favourite home for geckos, ants and wasps, which build nests in the electrical compartment and occasionally short something expensive.
None of this is a reason to panic. It's just a reason to look at the thing once a year.
What a real service includes
There's a meaningful difference between an aircon clean and an aircon service, and a fair bit of the market blurs the two.
Rinsing the two plastic filters behind the front cover is a clean. It's worth doing yourself every month or two over summer, and it's roughly ten percent of the job.
A proper service goes further:
The barrel fan and evaporator coils get chemically cleaned. This is the part that actually matters, and it's the part a filter rinse doesn't touch. It's also where the mould lives.
An anti-bacterial treatment and drain flush clears the condensate line before it blocks rather than after.
The outdoor condenser is cleaned so it can dump heat properly, and checked for nests, corrosion and damaged fins.
Gas pressure and temperature differential are measured, so a slow leak gets caught while it's cheap.
Electrical connections are checked and tightened. Terminations work loose over years of thermal cycling, and a loose connection under load is a genuine fire risk. This is also the part that legally requires a licensed electrician, not a cleaning contractor.
That last point is worth sitting with. Plenty of businesses will clean an air conditioner. Fewer are licensed to open the electrical side of it, which means the check most likely to prevent something serious is often the one that gets skipped.
The right time to book is now
Service work is cheap in September and expensive in December, not because we change our prices, but because in December it's usually a repair rather than a service, and because you'll be waiting.
We install air conditioning across Noosa, Pomona, Cooroy and the wider Sunshine Coast, and we service what we install. If we put your system in, we already know what's on your wall and what it needs.
Book a pre-summer service before the weather turns.
Book your air conditioning service or call us on (07) 5241 1611.
ARC Electrical Maintenance — QLD Electrical Contractor Licence 81573
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