Targeting high-risk homes by piloting complementary solutions in conjunction with resident engagement.

Extractor fans are essential in tackling damp and mould. However, there are circumstances where fans alone cannot control persistent humidity, particularly in overcrowded homes, where fuel poverty limits heating options, or where ventilation design is inadequate.

Here, we explore why piloting complementary solutions, combined with resident education and engagement, can help housing providers understand where these technologies are best suited.

Why Extractor Fans Are the First Step

Extractor fans remain the foundation of any effective ventilation strategy. They remove moisture at the source in kitchens and bathrooms and are vital for compliance with regulations. However, industry evidence and case studies show that fans sometimes cannot resolve persistent humidity problems when:

  • Homes are overcrowded and generate 15–18 litres of moisture per day from everyday activities.
  • Properties lack background ventilation due to sealed windows or inadequate trickle vents.
  • Residents disable fans, block vents, or avoid ventilation to save on heating costs.
  • Fuel poverty reduces heating in the home, leading to high relative humidity levels.

In these situations, mould often reappears despite fans being installed or repaired.

When Additional Measures Are Needed

Research highlights that ventilation alone is often insufficient if the relative humidity remains consistently above 60%, the threshold at which mould growth becomes likely.

Wall-mounted, tamper-proof dehumidification systems can complement, not replace, extractor fans. They provide:

  • Targeted moisture removal that prevents humidity from staying at unsafe levels.
  • Automatic operation where integrated humidistats activate only when humidity rises above a set threshold.
  • No tenant intervention is required as the water drains directly to waste.
  • Cost-effective performance compared to the expense of repeated repairs and disrepair claims.
  • Coverage is sufficient for most small to medium-sized homes.

These systems act as a second line of defence, maintaining safe humidity levels where fans alone cannot.

Why Resident Education Still Matters

Technology on its own is never enough. For long-term success, it must be combined with resident education and engagement.

Many households facing fuel poverty, overcrowding, or other social pressures need additional support to understand how to manage their homes effectively, preventing damp and mould. Without clear guidance, simple practices such as using extractor fans, ventilating rooms effectively, or heating adequately are often overlooked or deprioritised.

Helping residents understand how moisture is generated, why ventilation matters, and how small actions can improve air quality is essential. Education should focus on how to live in a healthy home, tailored to the realities of residents’ circumstances. This is not about blaming lifestyle, but about providing the right tools and knowledge so that households can work with the technology installed in their homes.

When residents are supported in this way, complementary solutions run more efficiently, issues are less likely to recur, and both residents and landlords see better long-term outcomes.

Why Piloting Matters

Not every home needs this intervention. The real value comes from piloting the technology in a small number of specific use cases, supported by resident engagement, such as:

  • Properties with sensor data showing consistently high humidity despite working fans.
  • Homes affected by overcrowding and fuel poverty, where ventilation alone has failed.
  • Cases with a history of repeated mould recurrence or disrepair claims.

Through a pilot, housing providers can:

  • Gather before-and-after sensor data to measure impact.
  • Test resident engagement approaches alongside technical performance.
  • Understand servicing requirements and resident feedback.
  • Develop a clear framework for when and where to deploy these solutions across their stock.

Proactive, Not Reactive

Extractor fans will always be the first line of defence. But in some homes, particularly those facing persistent high humidity, fans plus complementary dehumidification combined with resident engagement may be the only way to break the cycle of mould.

At ZapCarbon, we are already supporting a number of trials to help housing providers understand where these solutions are most effective. By working in partnership with residents and combining technology with education, we can build the evidence base for healthier homes, reduced complaints, and fewer disrepair cases.

Contact Us

If your organisation is interested in exploring a pilot, we would be glad to share learning from current trials and help design an approach tailored to your stock.

Contact us today via zapinfo@zapcarbon.com, or call 0845 052 3682.