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No it is not feasible. You are not digging up ground under then tens of thousands of houses that already exist in the city in any economically feasibly way.

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Community "large loop" heat pumps should help with the economics, but there are still lots of details to fill in.

I can come up with napkin tier ideas too. But lets leave the city planning to the professionals

No need to dig, only to do some drilling. It is very common here in Sweden. You just need to check the map first so you don't drill into the subway.

Dude, you're arguing semantics. A drill is still digging up dirt.

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