Energy used for heating and cooling comprises approximately 50 percent of total global final energy demand and 39 percent of energy-related carbon dioxide emissions. In the United States, heating and cooling account for more than 25 percent of total energy use across residential, commercial, and industrial sectors at a cost of $270 billion annually. Despite its large energy and carbon footprint and its significant potential to reduce carbon emissions, the use of renewable energy for heating and cooling applications, including biomass, biogas, geothermal, landfill gas, renewable electrification, renewable hydrogen, and solar thermal, has received relatively little attention compared with renewable electricity. The Renewable Thermal Collaborative (RTC) serves as the leading coalition for organizations that are committed to scaling up renewable heating and cooling at their facilities and dramatically cutting carbon emissions. RTC members recognize the growing demand and necessity for renewable heating and cooling and the urgent need to meet this demand in a manner that delivers sustainable, cost-competitive options at scale. The Renewable Thermal Collaborative is facilitated by the Center for Climate and Energy Solutions, David Gardiner and Associates, and World Wildlife Fund.