ASHP's are quite popular in Sweden even up here in the north since they are comparatively cheap and provides a noticeably better efficiency than direct heating even down to -20.
With that said though most people nowadays are switching to geothermal heat pumps which pretty much always manage a 4 to 5 times efficiency gain over direct heating..
Thanks for the insight. I am in northern france and am looking to install either an air source hp or a more expensive system that pumps from our aquifer 140 m below the ground and uses a water to water exchanger. Is this the same as your geothermal?