This heating and cooling report by the International Renewable Energy Agency (IRENA), the International Energy Agency (IEA) and the Renewable Energy Network for the 21st Century (REN21), highlights the benefits, identifies investment barriers, as well as the policies to drive faster uptake of renewable heating and cooling worldwide. Renewable Energy Policies in a Time of Transition: Heating and Cooling describes five possible transformation pathways, encompassing renewables-based electrification, renewable gases, sustainable biomass, and direct uses of solar thermal and geothermal heat.