How deep do geothermal pipes need to be?

Related questions

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5. How hot is 1000 feet underground?
6. Does turning the heat on and off cost more?
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Tags

1. #pipes
2. #advantages
3. #required
4. #trench
5. #system
6. #shape
7. #horizontal
8. #depending
9. #according
10. #thumb
11. #capacity
12. #trenches
13. #normally
14. #being