Is Your Air Conditioner Spreading Mould? The Gold Coast Truth by EvidiAir

Living on the Gold Coast means relying heavily on air conditioning to manage heat and humidity. But what many homeowners and business owners don’t realise is that their air conditioner could be actively spreading mould throughout their property.

One of the most common questions we hear at EvidiAir is: “Is my air conditioner making my indoor air unhealthy?”In Gold Coast conditions, the answer is often yes and here’s why.

Why Gold Coast Humidity Creates the Perfect Storm for AC Mould

The Gold Coast’s warm, humid, subtropical climate creates ideal conditions for mould growth inside both residential and commercial air conditioning systems.

The perfect environment for mould growth

Air conditioners remove heat by pulling moisture from the air. That moisture condenses on the cold evaporator coils and should drain safely away. However, three factors often combine to create a hidden mould problem:

• Constant moisture: High humidity keeps internal components damp for extended periods

• Organic food source: Dust, pollen, skin cells and debris bypass filters and stick to wet coils

• Dark, enclosed spaces: AC units provide exactly the environment mould thrives in

When condensate drains partially block with this organic sludge (biofilm), standing water forms, turning your AC into a mould nursery.

This affects:

• Split systems

• Ducted air conditioning

• Commercial HVAC systems

• Offices, gyms, childcare centres and homes

Is Your Air Conditioner Actually Spreading Mould?

Short answer: Yes, if mould is present

Unlike mould on walls or ceilings, mould inside an air conditioner is actively distributed by forced airflow.

How mould spreads through your AC

The fan barrel effect (split systems)

In split systems, the fan barrel sits directly behind the evaporator coil. As mould grows on the coil, it transfers to the spinning fan. When operating, the fan throws microscopic spores into the air, distributing them through your room every time the unit runs.

Ducted system distribution

In ducted or commercial air conditioning systems, mould spreads even faster. Once contamination takes hold in the indoor unit, the duct network becomes a delivery system, pushing spores into every connected room simultaneously.

This is why mould-related symptoms often appear throughout the entire home or workplace — not just in one room.

Why You Should Act Immediately

Ignoring mould in summer allows it to multiply rapidly, especially during periods of heavy AC use.

Health risks

Airborne mould spores can cause:

• Hay fever–like symptoms

• Persistent coughing or sneezing

• Asthma flare-ups

• Headaches and fatigue

• Skin irritation

These symptoms are frequently misdiagnosed as “summer colds” or allergies.

Efficiency and energy costs

Mould and biofilm coat coils and fan components, restricting airflow and heat transfer. The result:

• Longer run times

• Higher electricity bills

• Increased wear on compressors and fans

• Shortened system lifespan

Why Surface Cleaning Isn’t Enough

Sprays, wipes and DIY solutions only clean what you can see.Mould lives deep inside the unit — on coils, fans, drain pans and internal housings.

Without professional equipment, the biofilm remains and mould regrows quickly.

How EvidiAir Permanently Removes AC Mould

At EvidiAir, we use professional Hydro Clean and deep-system cleaning methods designed specifically for Gold Coast conditions.

Our process includes:

• High-pressure coil washing to remove biofilm and fungal growth

• Fan barrel and blower cleaning

• Drain-line flushing to eliminate standing water

• Internal casing and louvre sanitisation

• Antibacterial treatment to slow regrowth

This restores:

✔ Clean airflow

✔ Improved cooling performance

✔ Reduced energy consumption

✔ Healthier indoor air

Suitable for residential and commercial air conditioning across the Gold Coast.

Signs Your AC Is Spreading Mould

• Musty or “dirty sock” smell when turning the unit on

• Black or brown spots on vents or louvres

• Increased allergy symptoms indoors

• AC hasn’t been professionally cleaned in 12+ months

If you notice even one of these signs, mould is likely present.

Protect Your Air This Summer

Don’t let your air conditioner compromise your health or comfort.If your unit smells, struggles to cool or hasn’t been deep cleaned recently, it’s time to act.

EvidiAir provides expert mould removal, hydro cleaning and air conditioning servicing across the Gold Coast.

📞 0414753300

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