Poor ventilation throughout a home creates persistent conditions favourable to mould growth, particularly in rooms like bathrooms, laundries, and kitchens that regularly generate steam and moisture through daily household activities. Modern, well-sealed homes designed for energy efficiency sometimes inadvertently trap humidity more effectively than older, draughtier construction, since reduced natural airflow through gaps and cracks means moisture has fewer opportunities to escape without deliberate ventilation measures in place. Exhaust fans that are undersized for their room, improperly vented into a roof cavity rather than outside the building, or simply not run for long enough after showering or cooking all contribute to this ongoing ventilation challenge throughout many Illawarra homes. Condensation forming on windows during cooler months often signals this broader ventilation issue, indicating that humidity generated indoors isn't escaping effectively and will eventually find its way into wall cavities, window frames, and other vulnerable surfaces prone to mould growth. Addressing chronic ventilation problems typically involves assessing existing exhaust fan capacity and ducting, along with broader airflow patterns throughout a home, to identify practical improvements that genuinely reduce indoor humidity rather than simply masking the symptoms of a persistent moisture problem.