Collection: Dehumidifiers

Dust mites need moisture from the air to survive and reproduce — they don't drink, they absorb water vapour through their skin.

Reducing indoor humidity makes the environment less favourable for them. The AAAAI/ACAAI joint practice parameter on environmental control recommends keeping indoor relative humidity below 50% as part of a broader allergen reduction strategy.

A dehumidifier on its own isn't a treatment for allergies — it's one piece of a wider approach that typically also includes dust mite mattress protectors and pillow protectors, hot-washing bedding, andHEPA air purification.

Most allergy and asthma guidelines recommend keeping indoor relative humidity between 30% and 50%.

Below 50% dust mites struggle to thrive; below 30% the air becomes uncomfortably dry and can irritate eyes, nose and skin.

A simple hygrometer or air quality monitor will tell you what you're starting from — many Australian homes sit at 60–70% in summer or in coastal regions, well above the target range.

Both reduce humidity but work differently.

Desiccant units use an absorbent rotor and a heater — they work well in cooler conditions (below ~15°C) and are quieter, making them a common choice for bedrooms and southern Australian winters.

Compressor units work like a small fridge, condensing water out of warm air — they're more energy-efficient above ~18°C and better suited to larger spaces, laundries, and warmer Australian climates.

If your home gets cold in winter, lean desiccant; if you're in Queensland or northern New South Wales, lean compressor.

Dehumidifier capacity is measured in litres of water extracted per day under standard test conditions. A rough guide for Australian homes:

• Small bedroom or wardrobe (up to 15m²): 600ml–2L per day (compact portable units)
• Standard bedroom or office (15–25m²): 8–10L per day
• Living area or open-plan space (25–50m²): 10–12L per day
• Whole-house or active mould remediation (50m²+): 20L+ per day

Damp conditions, lots of windows, or active mould issues all push you toward higher capacity. If in doubt, size up — a larger unit running on a lower setting is quieter and more efficient than a small unit running flat out.

Put it in the room with the highest humidity, the worst dampness, or where allergy symptoms are worst — most often that's the bedroom, laundry, or bathroom.

Leave at least 30cm of clearance around the unit so air can circulate, keep windows and doors closed while it runs, and empty the tank regularly or use continuous drainage if your model supports it.

Many users find running it during the day in living areas and overnight in the bedroom gives the best balance.

Yes, indirectly.

Mould requires moisture to grow — most household moulds need relative humidity above 60–70% to colonise surfaces.

Keeping indoor humidity below 50% removes the conditions mould needs to spread.

The World Health Organization'sGuidelines for Indoor Air Quality link building dampness and mould exposure to higher rates of respiratory symptoms and allergies.

A dehumidifier won't remove existing mould — that needs cleaning and remediation — but it prevents recurrence by addressing the underlying moisture problem.

Pair with allergen and mould cleaning products for surfaces that already show growth.

Many parents do, particularly during humid Australian summers or in homes prone to dampness.

A few practical points: keep the unit out of reach of toddlers, don't aim the airflow directly at the cot, and avoid running humidity below 40% in a child's room — very dry air can irritate young respiratory systems and skin. For broader nursery setup, see our cot bedding and protectors.

If your child has a diagnosed condition like asthma or eczema, speak to your GP or paediatrician about whether dehumidification fits into their broader care.

They reduce humidity, which over time reduces the dust mite population — but the existing allergen load in bedding, carpets and soft furnishings doesn't disappear just because the air dries out.

Allergen reduction is a process: dehumidify the air, encase the mattress and pillows in fine-pore dust mite covers, hot-wash bedding weekly at 55°C+ (McDonald & Tovey,JACI1992),vacuum with HEPA, and ventilate.

A comprehensive bedroom approach has been shown to reduce allergen load roughly three times more effectively than any single intervention (van Boven et al.,World Allergy Organization Journal2024).

They do different jobs and work best together.

Dehumidifiersreduce humidity, making the home less hospitable to dust mites and mould.

Air purifiers with HEPA filtration capture airborne particles like pollen, pet dander, mould spores, and dust mite allergen fragments. If you have dust mite or mould allergies, a dehumidifier is the higher-leverage starting point. If your triggers are pollen or pet dander, prioritise a HEPA purifier.

Many households with multiple allergy triggers benefit from running both.

Power draw depends on type and capacity. A small Peltier (compact portable) unit uses 20–60W — cheap to run continuously, but limited extraction. A mid-sized compressor dehumidifier draws 200–400W; a large desiccant model can draw 500–700W when the heater cycles. At Australian average electricity rates (~30–40c/kWh in 2026), running a typical 10L compressor for 8 hours a day costs roughly $0.70–$1.20 per day. Most models have humidistats and shut off automatically once the target humidity is reached, which cuts running costs substantially.

Yes — over-drying.

If indoor humidity drops below about 30%, the air can irritate eyes, nasal passages and respiratory tract, and may worsen dry-skin conditions like eczema.

Set the unit's humidistat to your target range (40–50% is a common sweet spot), and consider a hygrometer to verify what you're actually getting. If you have a diagnosed respiratory condition, your GP or specialist is best placed to advise on optimal indoor humidity for your situation.

Sensitive Choice is a program run by the National Asthma Council Australia. Products that carry the blue butterfly mark have been assessed and considered suitable for people with asthma or allergies. The approval isn't a clinical claim — it indicates the product meets the Council's review criteria for that category. Several of the dehumidifiers in this collection are Sensitive Choice approved, including the Ionmax ION632 desiccant model.

General educational content. Not medical advice.