In the pursuit of energy-efficient homes, focusing solely on U-values can be misleading. This talk challenges the conventional wisdom that U-values are the be-all and end-all of thermal performance. We'll explore a holistic approach to building design that considers not just U-values but also factors like air tightness, thermal bridging, and the role of passive solar gain in achieving optimal comfort and efficiency. Understand how integrating these elements can lead to superior thermal performance, enhance living comfort, and reduce energy costs over the long term. Ideal for those looking to deepen their understanding of sustainable architecture, this session will provide a comprehensive look at creating thermally efficient and comfortable living environments.