This cluster-randomized controlled trial evaluates structural and behavioral strategies to reduce heat-related health risks in both urban and rural communities. The study focuses on developing and testing locally appropriate Heat Adaptation and Reduction Bundles (HAB) through participatory engagement, environmental assessments, and community-based implementation. By examining existing heat adaptation practices and piloting innovative interventions, the project aims to generate robust evidence on the health and economic benefits of practical heat-mitigation strategies. The findings are expected to inform scalable, context-specific policies to protect vulnerable populations in high-heat settings.