Best dehumidifier for mould removal
Best Dehumidifier for Mould Removal: What Australia Needs to Know
Mould growth is one of the most common and costly problems faced by Australian homes, rental properties, and commercial buildings. Whether caused by high humidity, water damage, or poor ventilation, mould can develop quickly — often within 24–48 hours — and lead to health issues, property damage, and expensive remediation work.
Choosing the best dehumidifier for mould removal is essential for controlling moisture, preventing mould growth, and protecting both health and property. In this guide, we explain exactly what features to look for, how dehumidifiers help with mould control, and our recommendations based on Australian conditions.
How Moisture Causes Mould
Mould thrives in environments where humidity levels exceed 60% relative humidity (RH). When indoor air remains moist, mould spores that are always present in the air can become active and grow on walls, ceilings, carpets, and furnishings.
High humidity can be caused by:
- Coastal and tropical climates
- Poor ventilation
- Condensation on cold surfaces
- Water leaks and flooding
- Bathrooms and laundry areas
The key to mould prevention is removing moisture before spores can grow.
Why a Dehumidifier is Essential for Mould Removal
A dehumidifier works by drawing moist air over cold coils, condensing the moisture into water, and releasing dry air back into the room. This reduces overall relative humidity, making the environment unfavourable for mould growth.
Simply cleaning mould without controlling moisture will not solve the problem — it only returns. The best dehumidifier for mould removal should:
- Maintain humidity levels below 50% RH
- Cover the space size effectively
- Work continuously with automatic control
- Be durable and energy efficient
Features to Look for in a Dehumidifier for Mould Control
✔ Extraction Capacity (L/day)
Dehumidifiers are rated by how many litres of moisture they can remove per day. For mould removal, choose a unit with sufficient capacity for your space:
- Medium rooms – 30–50L/day
- Large rooms & open spaces – 50–70L/day
- Severe mould & commercial areas – 70–90L/day
✔ Humidity Control & Digital Display
A built-in humidistat allows you to set a target humidity level (typically 30–50% RH). The unit will automatically cycle on and off to maintain this target — essential for mould prevention.
✔ Continuous Drainage Option
For prolonged mould removal or water damage drying, continuous drainage via hose makes operation hands-free and uninterrupted.
✔ Portability & Durability
For professional or multi-room use, wheels, strong handles, and rugged casing make a big difference in ease of use.
✔ Energy Efficiency
Units with efficient compressors and auto-shutoff when target humidity is reached can save running costs — especially important in Australian climates where dehumidifiers may run for days.
Top Dehumidifier Options for Mould Removal
Below are common professional choices based on space size and mould severity:
- 50L Dehumidifiers – Best for medium–large rooms, apartments, living spaces, and typical mould problems.
- 70L Dehumidifiers – Ideal for larger open areas, multiple rooms, commercial offices, and mould caused by water intrusion.
- 90L Dehumidifiers – Best for heavy mould issues, warehouses, industrial spaces, and restoration work.
Steps to Remove Mould Fast With a Dehumidifier
- Identify the source of moisture – leaks, condensation, humidity spike.
- Clean existing mould with appropriate mould cleaner and safety gear.
- Place the dehumidifier in the mould-affected area.
- Set humidity target below 50% RH and enable continuous drain.
- Run additional air movers to improve airflow and speed drying.
- Monitor with a hygrometer until mould risk is eliminated.
How Long Does It Take?
Drying timelines vary based on humidity levels, ventilation, and severity of moisture intrusion:
- Minor mould / high humidity only – 24–48 hours
- Moderate moisture – 2–5 days
- Severe mould & water damage – 5–10+ days
Using a commercial-grade dehumidifier, proper airflow, and continuous control dramatically shortens the drying and mould removal process.
Common Mould Mistakes to Avoid
- Only wiping mould without controlling humidity
- Using small portable dehumidifiers for large spaces
- Stopping operation too early
- Ignoring hidden moisture behind walls and floors
Mould Prevention Tips After Drying
- Maintain indoor humidity between 30–50% RH
- Ensure regular ventilation in bathrooms and kitchens
- Use exhaust fans where possible
- Regularly monitor humidity with a digital hygrometer
Final Thoughts
The best dehumidifier for mould removal is one that matches your space size, offers robust capacity, and maintains humidity below 50% RH. By combining the right dehumidifier with airflow and moisture monitoring, you can prevent and remove mould fast — protecting your property and your health.
Whether you’re dealing with moderate humidity or severe moisture intrusion, choosing a professional-grade dehumidifier makes all the difference in mould control and long-term prevention.
