Most new residential buildings in Sweden are already heated with ground-source heatpumps.
在瑞典，大多数新建的住宅建筑都已经由地源热泵系统供暖。
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Several countries have used subsidies to jump-start the market, including Japan, where almost 1 million heatpumps have been installed in the past two years to heat water for showers and hot tubs.