IEA (2023), Annual growth in sales of heat pumps in buildings worldwide and in selected markets, 2021 and 2022, IEA, Paris https://www.iea.org/data-and-statistics/charts/annual-growth-in-sales-of-heat-pumps-in-buildings-worldwide-and-in-selected-markets-2021-and-2022, Licence: CC BY 4.0