Municipalities have identified the need to scale-up energy efficiency and fuel switching within their existing building stock as a must do action within their Climate Action Plans. However, the scale of retrofits needed to achieve GHG reduction targets can feel overwhelming. Gabriella Kalapos from Clean Air Partnership will share research on how municipal retrofit programs are absolutely necessary, but just the start of the actions needed to build a supportive and effective retrofit ecosystem that will address market gaps and enable these programs to be effective at scale up.