Same heat transfer dynamics apply to cooling as well. Earth is a really good insulator, that's why it has a steady temperature in the first place. If you dump t

Same heat transfer dynamics apply to cooling as well. Earth is a really good insulator, that's why it has a steady temperature in the first place. If you dump too much heat in it, it will warm up. That's seen as an advantage when you can harvest the same heat in the colder months using geothermal heat pumps. Some buildings that have access to the ocean or a lake can use that for heat rejection because those take the heat away. None of these applications require going too deep in the ground. This article is all about going deep. Iceland has access to very hot water in shallow ground. They are unique that way.