The SEAI National Deep Retrofit Conference 2017 outlines energy policy ambitions to reduce CO2 emissions by at least 80% by 2050 through efficient energy use in the built environment. It emphasizes the need for evidence-based policymaking and the role of deep retrofit pilots in demonstrating technical feasibility, cost-effectiveness, and multiple benefits such as improved air quality and health. The document highlights the importance of integrating energy efficiency into broader government policies and decision-making processes.