Humidity, mould and dust mites in Australia

Humidity, Mould and Dust Mites

There is a strong connection between humidity, mould, and dust mites in Australia. Higher levels of humidity create a favourable environment for the growth of mould and the proliferation of dust mites. This moisture provides an ideal breeding ground for mould spores to thrive. When surfaces, such as walls or ceilings, become damp due to excess moisture, mould can begin to grow and spread. The presence of mould not only poses potential health risks but also indicates a moisture problem in the house.

Dust mites tend to be more prevalent in homes with higher humidity levels and constant warmth. Dust mites feed on discarded skin cells and are often found in areas where these cells accumulate, such as bedding, mattresses, and upholstered furniture. 

Connection Between Mould and Dust Mites

Coexistence of Dust Mites and Mould

The American Lung Association highlights a potential interrelationship between mould and dust mites. As mould grows on surfaces, it releases volatile organic compounds (VOCs) that attract dust mites. Dust mites feed on mould and produce waste particles, which can further promote mould growth. This coexistence and amplification can perpetuate the presence of both allergens in the indoor environment.

Environmental Conditions

Mould and dust mites prefer similar environmental conditions. They thrive in warm, humid environments where moisture is present. Mould and dust mites grow best in areas with moisture levels above 60%.

Allergy Triggers

Inhalation of mould spores and dust mite allergens can trigger allergic reactions in susceptible individuals. The Asthma and Allergy Foundation of America states that both mould and dust mite allergens are common triggers for asthma and allergic rhinitis symptoms. These reactions can include sneezing, coughing, nasal congestion, itching, and respiratory difficulties.

How to Control Humidity, Mould and Dust Mites

Generally, it is recommended to maintain humidity levels between 30% and 50%. This range helps prevent mould growth, dust mite infestations, and other moisture-related issues.

Controlling and maintaining optimal humidity levels in the house is crucial to minimise the growth of mould and reduce the population of dust mites, thereby promoting a healthier living environment.


Purchase a hygrometer, a device specifically designed to measure humidity levels. Place it in different areas of your home to get an accurate reading of the humidity in various rooms.


A dehumidifier is a device that extracts excess moisture from the air, helping to control humidity levels in the house. It is particularly useful in areas with high humidity or during damp seasons. Regular use of a dehumidifier can inhibit mold growth and discourage dust mite populations.

Air Conditioner

Air conditioning units not only provide cooling but also help to reduce humidity levels. They remove moisture from the air as it passes through the system, helping to control humidity and create an inhospitable environment for mold and dust mites.

Devanti Portable Air Conditioner Cooling Mobile Fan Cooler Dehumidifier

Ventilation Systems

Proper ventilation is essential in controlling humidity and preventing mold growth. Installing and using exhaust fans in bathrooms, kitchens, and laundry areas can effectively remove excess moisture. Additionally, opening windows and using natural ventilation can help maintain airflow and reduce humidity levels.

Fix Leaks and Moisture Sources

Inspect your house for any leaks, water intrusion, or moisture sources. Fix plumbing leaks, repair damaged roofs, and address any areas where moisture might be entering your home. Keeping your home dry and preventing water accumulation is crucial in controlling humidity.

Properly Insulate

Ensure your house is adequately insulated to minimize temperature variations and prevent condensation. Proper insulation helps maintain a consistent indoor temperature, reducing the risk of moisture buildup.

Minimise Indoor Drying

Limit indoor drying activities that add moisture to the air, such as drying clothes indoors or using unvented gas appliances. Opt for outdoor drying or use well-ventilated areas instead.

Moisture Absorbent Materials

Using moisture-absorbent materials, such as silica gel packs or moisture-absorbing crystals, can help control humidity in specific areas, such as closets or storage spaces. These materials draw moisture from the air, reducing dampness and inhibiting mold and dust mite growth.

Regular Cleaning and Dusting

Regular cleaning routines, including dusting and vacuuming, can help control dust mites. Using a vacuum cleaner with a HEPA filter can effectively capture dust mites and their allergens. It is also important to focus on areas where dust and skin cells accumulate, such as bedding, mattresses, carpets, and upholstered furniture.

Cleaning products

Encasements and Allergen-Proof Covers

Encasing mattresses, pillows, and box springs with allergen-proof covers can create a barrier, preventing dust mites from infesting these areas. These covers are designed to be impermeable to dust mite allergens, reducing exposure and potential allergic reactions.

Remember, it is important to combine these tools and strategies with good housekeeping practices and proper maintenance to effectively control humidity, mold, and dust mites in the home.

Is There a Difference in Controlling Humidity in the Summer and Winter?

Controlling humidity in the house requires different approaches in summer and winter. In summer, when humidity levels tend to be higher, it is important to focus on reducing excess moisture by utilizing dehumidifiers, promoting airflow through proper ventilation and the use of fans, and keeping windows and doors closed during humid periods.

In contrast, winter humidity control involves striking a balance between maintaining warmth and preventing condensation. Adequate insulation, sealing air leaks, and maintaining a consistent indoor temperature can help prevent excessive moisture and condensation on cold surfaces. Additionally, proper ventilation should be maintained to minimize moisture buildup while ensuring the preservation of indoor heating.


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