A common criticism of heat pumps is that they do not work in cold weather. However, the Nordic region – particularly Sweden, Finland and Norway – offers a rebuttal to this assessment, as our research at the Regulatory Assistance Project (RAP) shows. These three European countries have the highest heat pump sales per 1,000 households in the continent. Sweden, Norway and Finland also have the coldest climates in Europe. In all three countries, there are now more than 40 heat pumps per 100 households, more than in any other country in the world. A new survey provides new information about newer Heat Pumps that increasingly comes from low-carbon sources, and they lead to reduced carbon emissions.