Retrofitting, adaptive reuse, and renovation of existing buildings accounts for nearly half of U.S. architecture billings. However, building analysis is often time-consuming and cost-prohibitive, discouraging owners to move towards energy-efficiency with their current stock. This session discusses simple, cost-effective evaluation tools that can quickly identify pinch points, and result in more comfortable indoor conditions, and reduced operational and embodied carbons. Using Hawaii Department of Education's districtwide heat abatement program and a California multi-housing renovation project, among other case studies, we'll present a tool kit of design and engineering strategies that can be employed for any existing building. By improving what already exists, we can reduce waste and carbon while bettering communities; a payback that goes beyond utility bills.