Stock Photo - 24 March 2022, Baden-Wuerttemberg, Rottweil: An air-source heat pump is located in the basement of a residential building. The heat pump is considered the environmentally friendly and future-proof alternative to oil and gas heating. Photo: Silas Stein/dpa. - Rottweil/Baden-Wuerttemberg/Germany

Stock Photo: 24 March 2022, Baden-Wuerttemberg, Rottweil: An air-source heat pump is located in the basement of a residential building.

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