Half of New Zealand homes are too cold and damp, falling below World Health Organization standards. This leads to respiratory illnesses for 1 in 6 Kiwis, with children most affected. As New Zealand’s largest home lender, ANZ Bank wanted to tackle this issue, but faced a cultural mindset of “toughing it out” through winter. The challenge was to educate households, inspire action, and drive engagement with ANZ’s Healthy Homes Initiative, which offered interest-free loans for insulation and heating. To make the invisible problem visible, we created Mr Humfreez, a world-first household device designed to show when a home is unhealthy. Made from biodegradable materials and requiring no power, Mr Humfreez uncurls his horns when humidity rises above 65% and turns blue when temperatures fall below 18°C. Playful, intuitive, and scientifically calibrated, he was designed to resonate with the very families most affected, especially children. By embodying data in a character, Mr Humfreez transformed awareness into empathy and action. Outcome: - Generated a $30.80 revenue return for every $1 spent on media - Delivered a 24.5% lift on all previous home loan advertising - Tripled ANZ brand association with “warmer, more efficient homes” - Increased search volume fivefold compared to other campaigns - Attracted partnership interest from government agencies and NGOs Following overwhelming demand, mass production is now underway, with trials in schools positioning Mr Humfreez as both a teaching tool and a long-term symbol of healthier homes for future generations.