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I read somewhere that you can just drill a well and install a big coil?

News to me. But probably similarly expensive once the environmental regulations for wells, etc, and it's excavation are considered. And even fewer installers who are qualified to do it.

You are making this up as you go :)

Yes they are often installed in bores into bedrock.

All those pesky Scandinavians must be doing it because it makes economic sense.

Step back and think that if you don’t know the details then all the excuses you can imagine are probably misleading or wrong.

I see you just skipped to responding to the end of the comment chain instead of reading it. Common mistake. Here is what you missed,

>If the big initial cost is rolled into home construction it would be less daunting and more normal. So I expect newer homes to adopt heat pumps in cold areas but with little adoption in existing homes.

In Scandinavia heat pumps are often replacing wood burners in existing houses. Source: I live there

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