IEA (2020), Share of households purchasing heat pumps for heating and hot water production in selected regions the Sustainable Development Scenario, 2010-2030, IEA, Paris https://www.iea.org/data-and-statistics/charts/share-of-households-purchasing-heat-pumps-for-heating-and-hot-water-production-in-selected-regions-the-sustainable-development-scenario-2010-2030, Licence: CC BY 4.0