An illustration of a slinky 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) | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Shockey, Gwen |
Taille de l’image : | 2247 px × 1770 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
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