The 2024 American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) Decarbonization Conference will be an information and idea exchange between stakeholders in the built environment industry concerning the timely and important topic of reducing carbon emissions from existing buildings in cold climates. The focus for the conference will be replicable decarbonization technical solutions for existing large and tall buildings, where the density of construction makes this sector one of the most difficult to decarbonize. The conference will highlight substantial global activities and research driving decarbonization demonstrations, and technical and financial case studies for large building solutions.