The document discusses the challenges and strategies for scaling home retrofitting efforts in the U.S. to meet a government target of 10 million retrofits annually by 2020, starting from 250,000 in 2009. It critiques various proposed models for achieving this scalability, emphasizing the need for effective business practices, public incentives, and maintaining quality service. The author advocates for a performance-based, standards-oriented approach that includes incentives and financing to support widespread adoption of energy-efficient retrofitting, ensuring a sustainable industry that can address climate and energy goals.