Introduction: Designing for Climate Is Not Optional in Bangladesh Bangladesh presents a complex climate profile: High temperature and humidity Intense solar radiation Heavy monsoon rainfall Occasional flooding A house that ignores these realities will overheat, retain moisture, and degrade faster. The objective is simple: Reduce heat gain, remove heat quickly, and protect against water. Understand the Local Climate First Key Climate Forces: Sun:  Strong east-west exposure Win

Introduction Heat Gain Is a Design Failure, Not a Climate Problem In tropical regions, excessive indoor heat is often blamed on climate. That’s misleading. The real issue is uncontrolled heat gain through: Solar radiation Conduction through building envelope Poor ventilation A well-designed tropical building can reduce heat gain significantly and maintain thermal comfort with minimal reliance on mechanical cooling. Understanding Heat Gain: The Three Entry Points 1. Solar Rad

Introduction Small House ≠ Easy Cooling Here’s the flawed assumption:“Small houses are easier to cool.” 👉 Wrong. Small houses: Heat up faster Have limited airflow paths Often suffer from poor window placement So ventilation must be intentional, not incidental . The Core Principle: Air Must Flow, Not Just Enter Ventilation fails when: Air enters but doesn’t exit Openings are misaligned Internal partitions block flow Think of airflow as a continuous path , not random opening

Introduction Designing a house in a hot climate without considering orientation is like building blind. Orientation alone can reduce indoor temperatures by 3–5°C —without any mechanical cooling. In regions like Bangladesh or Southeast Asia, where heat and humidity dominate, your design decisions must start with one principle: Control heat gain before you try to remove it. This guide breaks down orientation strategies using first principles—not vague advice—so you can design