Over the last 15 years, the U.S. homebuilding industry has seen a remarkable transformation. Residential building systems have rapidly evolved to offer unprecedented levels of efficiency and performance. This course provides a data-driven look at the role of propane as an energy option in today's high-performance homes. The course compares propane with other available energy sources in terms of its availability, applications, and environmental footprint. At the technology level, the course examines 12 different propane applications in terms of their functionality, efficiency, cost-effectiveness, and environmental impact.