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Heat pumps can't take the cold? Nordics debunk the myth
(techxplore.com)
This is a most excellent place for technology news and articles.
that's not the geothermal we are talking about, geothermal heat pumps
https://www.energy.gov/energysaver/geothermal-heat-pumps
Those are ground source heat pumps.
Seriously by that nomenclature we'd also have aerothermal heat pumps.