Start now!
dremd,
Start now, the digging part is what takes so much time.
Call some local installers and ask what the preferred local configuration is. Is it slinkys in ditches or is it boreholes? How much earth exchanger do you need to take care of your house?
You can buy or modify or build the heat pump part during the cold months.
Start now & take lots of pictures to share with us.
Good luck!
Best Regards,
-AC_Hacker
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