An illustration of a pond loop geothermal heat pump. Geothermal heat is a central heating and cooling system that uses the earth as a heat source (in the winter) or a heat sink (in the summer) | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Shockey, Gwen |
Bildgröße: | 2241 px × 1767 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: |
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