The document provides a case study analysis of Deck House in Janda Baik, Malaysia. It investigates the use of open layout plans and passive design strategies to reduce heat gain challenges in the tropical climate. Deck House integrates traditional Malay vernacular design approaches, such as elevated structures, large overhanging roofs, lightweight and breathable materials, cross ventilation, and preservation of surrounding vegetation. The open plan and minimization of interior partitions allows cross breezes to naturally ventilate the interior. Strategies like louvers, operable windows, and orientation further aid ventilation and thermal comfort without mechanical cooling. The design successfully demonstrates how vernacular principles can inform modern tropical architecture.