This is surely the decade for real climate action. The Intergovernmental Panel on Climate Change (IPCC) warned that unless we achieve certain targets by 2030, we may pass the point of no return on many climate-related trends. California has always been a leader in the United States for climate action in wide ranging sectors, including residential energy efficiencies. Building codes have grown more stringent over time, requiring new homes to be energy efficient and ready for renewable energy generation. However, that still leaves millions of existing buildings that fail to meet these new standards. Existing buildings haven’t been ignored, but multiple efforts around the state to encourage retrofitting and electrifying existing homes have been disparate and have made only incremental changes. The efforts have been laudable, but insufficient to the California goal of increasing existing buildings’ energy efficiency by 50 percent by 2030.