I am confused of the purpose of your post?
I know Scandinavia is far away from the US. Your post implies that my knowledge/experience of Scandinavia has no bearing on the discussion.
Ken is is Markle, IN average yearly temp 50.19°F, Stockholm Sweden average yearly temp 43.9 °F. I think that is close enough.
I replied to prairisky, his profile says Canada which has similar climate to Scandinavia.
I am surprised at the loop depth prairisky mentioned. Physics works the same regardless of county and I do not see the economic gains of a loop depth of 20 feet but I sure there is a reason for it, just trying to learns something.